Downloading Mavericks (and any app), Error "Distribution file could not be verified"

When trying to download Mavericks (any app actually), an error comes up in the App Store, "The product distribution file could not be verified. It may be damaged or was not signed." I've tried clearing all caches and even starting in Safe Mode but nothing works.
This is what comes up in Console:
10/24/13 10:06:01.045 AM App Store[493]: *** Assertion failure in -[ISDistributionManager verifyDistributionAtURL:allowsDevSign:itemIdentifier:error:distributionControll er:], /SourceCache/Pisa/Pisa-135.34/ISDistributionManager.m:155
10/24/13 10:06:01.045 AM App Store[493]: FRPurchaseManager: Preflight operation for 675248567 failed with error: Error Domain=com.apple.appstore Code=0 "The product distribution file could not be verified. It may be damaged or was not signed." UserInfo=0x7fd2c0477c90 {NSUnderlyingError=0x7fd2c413cb10 "The requested URL was not found on this server.", NSLocalizedFailureReason=Cannot create PKProduct from "file://localhost/var/folders/yx/n_8mrp_50f1d8n5wr4yc2w1h0000gn/C/com.apple.app store/675248567/preflight.pfpkg" Error Domain=NSURLErrorDomain Code=-1100 "The requested URL was not found on this server." UserInfo=0x7fd2c4159310 {NSUnderlyingError=0x7fd2c0449d40 "The requested URL was not found on this server.", NSErrorFailingURLStringKey=file:///var/folders/yx/n_8mrp_50f1d8n5wr4yc2w1h0000g n/C/com.apple.appstore/675248567/preflight.pfpkg/index.sproduct, NSErrorFailingURLKey=file:///var/folders/yx/n_8mrp_50f1d8n5wr4yc2w1h0000gn/C/co m.apple.appstore/675248567/preflight.pfpkg/index.sproduct, NSLocalizedDescription=The requested URL was not found on this server.}, NSLocalizedDescription=The product distribution file could not be verified. It may be damaged or was not signed.}
I've done the whole, delete the folders in /var/folders/ but it hasn't worked. I've also reset the App Store through the debug menu. I've booted into Safe Mode, and still nothing. I've also tried to restore permissions on my drive and that didn't work. Any other ideas?

Turns out it was a firewall blockage on our own network. Contact your IT department if none of the other cache-clearing fixes work I guess.

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I went to Purchases and it worked from there having had the same problem you describe.

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The product distribution file could not be verified. It may be damaged or was not signed.

This should also work for Mountain Lion.
Mavericks Download can’t be verified

HT201364 The product distribution file could not be verified. It may be damaged or was not signed. What now!!!

Trying to upgrade to Mavericks but get The product distribution file could not be verified. It may be damaged or was not signed.
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Remember: we cannot see your machine. There are 9 different versions of iPhoto and they run on 8 different versions of the Operating System. The tricks and tips for dealing with issues vary depending on the version of iPhoto and the version of the OS. So to get help you need to give as much information as you can. Basic things like :
- What version of iPhoto.
- What version of the Operating System.
- Details. As full a description of the problem as you can. For instance: 'iPhoto won't export' is best explained by describing how you are trying to export, and so on.
- History: Is this going on long? Has anything been installed or deleted?
- Are there error messages?
- What steps have you tried already to solve the issue.
- Anything unusual about your set up? Or how you use iPhoto?
Anything else you can think of that might help someone understand the problem you have.

I can't download an app or update ,It says ( the product distribution file could not be verified) in App Store ,and in iTunes says An unknown error occurred (-50) ?

Hi:all
I can't download an app or update ,It says ( the product distribution file could not be verified) in App Store
,and in iTunes says An unknown error occurred (-50) ?
Help Please.

See this link from another similar question. It may need patience to resolve. I think Thomas Reed's suggestion is best place to start.
App Store rejects buy of Mountain Lion: Apple Support Communities

HT201364 trying to download os x mavericks and i get an error saying "The product distribution file could not be verified. It may be damaged or was not signed." how do i fix this so i can update my new macbook pro?

"The product distribution file could not be verified. It may be damaged or was not signed."
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"Update your new MacBook Pro"?
Well, if your MacBook Pro is new, it already has Mavericks installed and there is nothing to update.
Go to the Menu Bar, and click the Apple logo. Then click "About This Mac." Does it show OS X 10.9 or 10.9.1?
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I am using Mac OS X 10.7.5 as of now and when I am trying to upgrade to Mavericks, it is throwing error "The product distribution file could not be verified. It may be damaged or not signed".

I am using Mac OS X 10.7.5 as of now and when I am trying to upgrade to Mavericks, the App Store is throwing error "The product distribution file could not be verified. It may be damaged or not signed".
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Kindly help.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in “normal” mode, not in safe mode. If you’re now running in safe mode, reboot as usual before continuing.
Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
Some of the commands will line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it. The headings “Step 1” and so on are not part of the commands.
Note: If you have more than one user account, Step 2 must be taken as an administrator. Ordinarily that would be the user created automatically when you booted the system for the first time. The other steps should be taken as the user who has the problem, if different. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Triple-click anywhere in the line of text below on this page to select it:
kextstat -kl | awk '!/com\.apple/{printf "%s %s\n", $6, $7}' | open -ef
Copy the selected text to the Clipboard by pressing the key combination command-C. Then click anywhere in the Terminal window and paste (command-V). I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting. A TextEdit window will open with the output of the command. If the command produced no output, the window will be empty. Post the contents of the TextEdit window (not the Terminal window), if any — the text, please, not a screenshot. You can then close the TextEdit window. The title of the window doesn't matter, and you don't need to post that. No typing is involved in this step.
Step 2
Repeat with this line:
{ sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|cups|isc|ntp|postf|x)/{print $3}'; echo; sudo defaults read com.apple.loginwindow LoginHook; echo; sudo crontab -l; } 2> /dev/null | open -ef
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Note: If you don’t have a login password, you’ll need to set one before taking this step. If that’s not possible, skip to the next step.
Step 3
{ launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)/{print $3}'; echo; crontab -l 2> /dev/null; } | open -ef
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ls -A /e*/{cr,la,mach}* {,/}Lib*/{Ad,Compon,Ex,Fram,In,Keyb,La,Mail/Bu,P*P,Priv,Qu,Scripti,Servi,Spo,Sta}* L*/Fonts .la* 2> /dev/null | open -ef
Important: If you formerly synchronized with a MobileMe account, your me.com email address may appear in the output of the above command. If so, anonymize it before posting.
Step 5
osascript -e 'tell application "System Events" to get name of login items' | open -ef
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If you have Intego VirusBarrier X6 installed
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Several causes for this problem have been reported. Please take each of the following steps that you haven't already tried. Stop when it's resolved.
Step 1
Back up all data.
From the menu bar, select
 ▹ System Preferences... ▹ Network
If the preference pane is locked, click the lock icon in the lower left corner and enter your password to unlock it. Then click the Advanced button and select the Proxies tab. If any proxy options are selected, make a note of them and then deselect them. You don’t need to change the bypass or FTP settings. Click OK and then Apply. Test. The result may be that you can't connect to any web server. Restore the previous settings if that happens.
Step 2
Rebuild the Spotlight index. If you try to search now from the magnifying-glass icon in the top right corner of the display, there will be an indication that indexing is in progress.
Step 3
Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you boot, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

HT201364 I have a 2013 iMac, with OS X version 10.8.5. Have been trying to download OS X Mavericks without success; error message "we could not complete your purchase, the product distribution file could not be verified, etc". Please help; TQ

I have a 2013 iMac, with OS X version 10.8.5. Have been trying to download OS X version 10.9 (OS X Mavericks) without success; error message "we could not complete your purchase, the product distribution file could not be verified, etc". Please help; TQ

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you boot, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

I tried downloading the latest OS X Mountain Lion and [after a long time... I have a slow connection] I got an error message ... The product distribution file could not be verified. It may be damaged or was not signed.

Hi folks,
I tried downloading the latest OS X Mountain Lion and [after a long time... I have a slow connection] I got an error message ... We could not complete your purchase The product distribution file could not be verified. It may be damaged or was not signed.
Everytime I retry or continue the download I just keep getting the same error message!!!
What can I do to get my product?
PM

The only thing that worked for me was to boot in safe mode.
Power down. Then press power button and hold 'shift' key until grey screen with progress bar appears... Once booted and logged in just open safari and browse to applestore.
No trouble at all once I did this.
Reminder: create full backup before you upgrade OS
Hope it helps.

I purchased the mountain lion and while downloading an error message appear :The product distribution file could not be verified. It may be damaged or was not signed. what i've to do to complete downloading??

please help me coz i'm anew mac user and i don't have much knowledge about mac system

how can i skip his error ( The product distribution file could not be verified. It may be damaged or was not signe )
because it's driving me crazy

Mavericks Update - Error message - The product distribution file could not be verified

Help!
Trying to download mavericks (from 10.7.5) as I have just had a new hard disk isntalled and need to start from scratch.
Wanting to re download iphoto but I can't as I need a newer OS so trying to download mavericks from the app store. My internet is very slow and keeps cutting out so I have tried a few times but it's not working.
Now I'm getting an error message - 'the product distribution fil could not be verified'
If anyone can help that would be great.
Or even let me know where I can get a copy of iphoto to suit OS 10.7.5 so I don't need to download a whole new OS.

You're trying to download a 5 GB file. If your Internet connection is lousy, you won't have much success. Try another network.

When ever i'm trying to install an app from the app store i'm getting the following error "We could not complete your purchase - The product distribution file could not be verified. It may be damaged or was not signed", plz help me to rectify this .

when ever i'm tring to install an app from the app store i'm getting the following error.
"We could not complete your purchase - The product distribution file could not be verified. It may be damaged or was not signed".
someone plz help me to overcome this.

Installing the appropriate combo update may help...
If you are running v10..7 Lion, install the OS X Lion Update 10.7.4 (Client Combo)
For 10.6 Snow Leopard > Mac OS X 10.6.8 Update Combo
Then restart your Mac. Try the App Store.
If that doesn't help, try the following..
Quit the App Store if it's open.
Open the Finder. From the Finder menu bar top of your screen click Go > Go to Folder
Type this exactly as you see it here:
/Library/Preferences/SystemConfiguration
Click Go
Move the NetworkInterfaces.plist file from the SystemConfiguration folder to the Trash.
Relaunch the App Store and try downloading Mountain Lion.
You may also need to disable anti virus software and turn off the Firewall in System Preferences > Security (or Security & Privacy) > Firewall

Downloading Mavericks (and any app), Error "Distribution file could not be verified"

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