Update "file could not be verified" adobe acrobat CPSID_50026

When I try to update Acrobat v9 to v9.2.0 the update will not complete the installation.
I get an error "The file could not be verified" adobe acrobat 9.2.0 CPSID_50026
Anyone got any ideas how to fix this?
David

Sorry that didn't work.
I tried updating manually to v9.1.0 but that did not work either.
If I go 'Help' > 'Check for updates' it goes straight to the update to v9.2.0 - but then fails to instal it.
If it helps I am using Windows XP.

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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, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. 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.
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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.
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You're trying to download a 5 GB file. If your Internet connection is lousy, you won't have much success. Try another network.

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Product distribution file could not be verified

Hi
I keep getting the following message "The product distribution file could not be verified. It may be damaged or was not signed" whenever i try to update my software. I've been getting the problem for a while, couldn't find asolution that worked and decided to wait for Mountain and see whether the problem resolved with the install. It didn't, and still occurs with Mountain Lion.
The strange thing is the App Store on my MacBook Pro works fine, its my iMac that I'm having the problem with.
I have tried the following as suggested on various forums:
1. open terminal and enter!
rm -rf ~/Library/Preferences/com.apple.appstore.plist
rm -rf ~/Library/Preferences/com.apple.storeagent.plist
rm -rf ~/Library/Preferences/ByHost/
2. Delete App Store from Applications and reinstall using an update. Problem was I couldn't delete as it told me “App Store” can’t be modified or deleted because it’s required by Mac OS X."
3. Installing Mountain Lion.
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Suggestions anyone?
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Try this..
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:
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Click Go
Move the NetworkInterfaces.plist file from the SystemConfiguration folder to the Trash.
Relaunch the App Store.

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Donald...
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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

HT1338 The product distribution file could not be verified. It may be damaged or was not signed.

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Hi,
Spent hours on this, fixing permissions, reinstalling combo download, removing virusbarrier, no good.
Then found this and worked for me, simples!!
http://blogs.picpacwrack.net/2011/11/you-need-command-line-on-mac-too.html

Update "file could not be verified" adobe acrobat CPSID_50026

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