Invalid Signature and corrupted files

Hi, I'm new to all this and don't normally have trouble with iTunes or my iPod but yesterday I tried to install the new version of iTunes and I kept getting a notice saying "Invalid Signature" and the download would stop. I also bought some stuff from the iTunes Store but when I tried to download them it said that the files were corrupted. I'm a bit annoyed as I've bought songs and audiobooks and can't retrieve them. Can anyone help?
Thanks :o)

yesterday I tried to install the new version of iTunes and I kept getting a notice saying "Invalid Signature" and the download would stop. I also bought some stuff from the iTunes Store but when I tried to download them it said that the files were corrupted.
The invalid signature message often indicates that the installer is getting damaged on the download. (Much like your files, I suspect.)
How are you connecting to the internet at the moment?
For example, my Lenovo T61 is connecting wirelessly to a LinkSys WRT54G wireless router that is plugged into a Motorola SB5100 Surfboard cable modem.
What sort of setup do you have?

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Invalid Digital Signature and corrupted files???

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ever since i have been asked to upgrade to 7.2, i have not been able to ugrade to 7.2 due to a invalid digital signature.
although the following document refers to a slightly different error message, perhaps give it a try:
iTunes: Windows reports that iTunesSetup.exe is not a "valid Win32 application"
... but if no joy there, try the following Microsoft document:
(MS) You cannot install some updates or programs

When downloading updates for Quicktime 7 and Itunes 10 I keep getting an error saying that files shared by these updates has an invalid signature and that the downloaded has been removed.

When downloading updated for Quicktime 7 and Itunes 10 I keep getting an error saying that files shared by these updates has an invalid signature and that the downloaded has been removed. If I don't get that message I get a message saying that the download was unsuccesful and that in order to download I need to go to tools and then select dowload only. Please help I really want to update my iphone!

Thanks for helping out, but I already tried these steps.
I even tried this on a iMac with similar results. The only difference was that the errorcode was called 2001 instead of 21.
Today I took the phone to www.iphoneambulancen.dk. A guy (in Aarhus, Denmark) that specializes in iPhone repairs. I figured, that given his occupation he'd seen most errorcdes. Two hours later, he called me back, and told me that he had replaced the battery.
So, it turns out that a broken battery can cause this behaviour.
But thanks again

Photoshop CC extension with invalid signature and Photoshop default installed extensions cannot be loaded

I have a Creative Cloud subscription for Photoshop CC. All Creative Clouds products are updated to the latest versions. When I tried to install Tony Kuyper's TKActionv3 Photoshop extension using the Adobe Extension Manager CC on my PC desktop, I received an error message the extension contained an invalid signature and wouldn't be installed. I had previously installed the extension on my laptop without any problems. At the same time, I also noticed the default installed Photoshop CC extensions (e.g., Adobe Exchange, Kuler, Mini Bridge, Behance) could not be loaded using the Windows/Extension command. I receive an error message that the command could not be completed because the extension could not be loaded. After contacting Tony Kuyper, he suggested that I try the steps mentioned in the following weblink: https://forums.adobe.com/message/6029768. The steps basically consist of uninstalling and reinstalling all the Creative Cloud apps associated with Photoshop CC. I tried the steps multiple times, but I am still having the same problems. I can find the default installed Photoshop CC extensions on my machine, so I don't know why they can't be loaded.
I posted this question in the Extension Manager group. Should I also post it in the Adobe Photoshop group?
Thanks for your assistance,
Mark Curtis

Zhihong,
I received your e-mail with the questions below. I answered some of your questions: answers in red and underlined. In addition to posting in the forum, I also replied to your e-mail address, but the message was returned as undeliverable. What e-mail address should I use for sending you the log files.
Thanks,
Mark
Hi Mark,
Here is a workaround to make the extension display again:
You can bypass the check for extension signature by editing the CSXS preference properties file, located at:
• Win: regedit > HKEY_CURRENT_USER/Software/Adobe/CSXS.5
• Mac: /Users/<username>/Library/Preferences/com.adobe.CSXS.5.plist
Add a new entry “PlayerDebugMode” of type "string" with the value of "1". And then restart Photoshop and try again. Please let us know if this work around can work.
And could you please help to offer following information for us to find the root cause? Thanks:
1. Which PS version are you using? On what platform, Windows or Mac OS? Photoshop CC (64-Bit) 14.2.1 x64, Windows 7 Ultimate (64-Bit)
2. The extension cannot be loaded since when? 5/25/2014
3. What is the version of imslib.dll/.framework and PlugPlugOwl.dll/.framework? It locates at path like “C:\Program Files\Adobe\Adobe Photoshop CC (64 Bit)”. 7.0.0.145, 4.2.0.36
4. Can you get the CSXS log and send it to us? Please add a “LogLevel” key with value “6” in registry (PS should be restarted for the log level change to take effect):
• Win: regedit > HKEY_CURRENT_USER/Software/Adobe/CSXS.5
• Mac: /Users/USERNAME/Library/Preferences/com.adobe.CSXS.5.plist
Then restart PS and the log file will be generated at:
• Win: C:\Users\USERNAME\AppData\Local\Temp\csxs5-PHSP.log
• Mac: /Users/USERNAME/Library/Logs/CSXS/csxs5-PHSP.log
Thanks!

When I try to update to Itunes 11 I get an error message saying that Itunes has an invalid signature and wont be installed. I use Windows 7.

Everytime I try to update to Itunes 11 I get an error message saying that Itunes has an invalid signature and can't be installed? I have tried to install it two times and get the same message each time. Any solutions to my problem?? Those who have installed ITUNES 11 is it hard to work with? maybe im lucky it wont update?? I don't know.

That suggests that the installer is getting damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

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I am trying to update iTunes to new version .
When it goes to install i get a message saying iTunes has an invalid signature and will not install.
Any help please.

Go directly to Apple link to download
http://support.apple.com/kb/DL1426
Select "Save" instead of "Run". Once downloaded, double click the iTunesetup.exe to install.

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I am trying to download the new version of itunes and it is stating that it has an invalid signature and the downloan has been removed. How can I download it or get the signature?

Try the following user tip:
Troubleshooting issues with iTunes for Windows updates

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When downloading the newest version, I get an error message saying iTunes has an invalid signature and will not be downloaded. Help!!!!!

Thank you for using the Apple Support Communities
I am assuming you are having difficulties installing the latest version of iTunes. Are you using a Windows PC or a Macintosh? Which version of Windows or OS X are you using?

When trying to install update 10.5 it says the download has invalid signature and won't install. I run XP

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1. Itunes
2. Quicktime
3. Apple software update
4. Apple mobile device support
5. Bonjour
6. Apple application support
I've noticed now that 'quicktime' didn't get reinstalled, not sure if that's the problem. Also when I rebooted after the last Uninstall I received a new error message ' Applesyncnotifier.exe - unable to locate component'. I've also noticed that my CPU is running at 50% according to task manager when I've got apple loaded, but it goes down to less than 20% when it's uninstalled and even goes down to 0%. Clearly, there are a number of people with similar issues and Apple need to sort it quickly.

When updating iTunes I get a message saying invalid signature and it won't update, is there a fix for this?

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Hi there Jmd65,
You may find the troubleshooting steps in the article below helpful.
Issues installing iTunes or QuickTime for Windows
http://support.apple.com/kb/ht1926
-Griff W.

Trying to upgrade itunes on windows computer error comes up invalid signature and will not install, trying to upgrade itunes on windows computer error comes up invalid signature and will not install

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Praise God - I found the solution after hours of work: (1) Uninstall all Apple programs (itunes, Quicktime, Bonjour, .....); (2) Go to "Common Files" and delete all Apple files - this might be difficult for some are locked from you - you may have to change the "Owner" of the file in order to delete it - if that doesn't work "Rename the Apple Follder to something like Apple Old - that's like deleting it. Then download 10.5 from Apple and away you go - yippee.

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When I try to download the latest version of iTunes from apple.com, I get the message "Content was blocked because it was not signed by a valid security certificate."When I open iTunes and try to download the latest version there, I get the message "iTunes has an invalid signature. The download has been removed." I have also gotten an Internet Script Error stating that an error has occured in Line 0, Char O and that "Access is denied to images.apple.com/global/scripts/lib/iepngfix.htc." This problem has never occurred with earlier versions of ITunes. Anyone know how to fix this problem?

Are you downloading iTunes form an Apple website or somewhere else? If the answer is somewhere else, try downloading it from Apple. Click on iTunes in the black menu bar above and go from there.
Let us know what happens.

Strange noise and corrupted files and trouble fixing

hi. forgive me if someone's answered this already, but my eyes are bleeding reading through all the comments without finding a fitting answer. my ibook g3 dual usb has been great all these years. every once in a while i get the "unable to mount" question mark folder at startup and have been able to fix it using the disk utility first aid stuff that came with my computer. but i've also had trouble in the last few years with corrupted files paralyzing my computer anywhere from a few seconds to hours till i have to force shut down. when my computer comes upon a corrupted file it starts making this slight whiny grinding noise that happens as a series of noises - like eeeer eeer eeer eeer eeer - over and over. it immediately stalls all functions of the desktop/computer.
this last time, it happened while downloading a .pdf. unfortunately, after force shutting down, i got the question mark folder when i started back up and none of the utilities or norton disk doctor have been able to fix it. i tried running the hard disk testing utilities and disks, and it keeps saying the hard drive is fine. but whenever i run disk recovery with norton i suspect it comes upon corrupted files and starts with the grinding noise. i'm trying not to completely reinitialize the hard disk until i know i've tried everything. i just want to recover a few things, but i don't know how to isolate the corrupt files to trash.
under the repair function of the disk first aid, it says theres some kind of pdef problem or something, and that it cannot repair. DOES ANYONE HAVE ANY IDEA WHAT I SHOULD DO!!!! P L E A S E. i feel like i've tried everything, including the custom loading of softwar install....
thanks

Hi, and welcome to Apple Discussions.
The iBook would have come with the first version of OS X (likely OS X 10.0.3) installed on it. Using Norton DiskDoctor on any hard drive that has an OS X volume on it can actually cause hard drive corruption. DiskDoctor also reports the OS X files as "errors," so any "errors" it reports are not to be believed (although, as I said, using it can actually create corruption).
Could you please report the exact message you get when trying to repair the hard drive using Disk First Aid from the Install CD?
You may want to try a command-line method called "fsck" (for "file system check") to attempt to repair the hard drive. To use fsck, you have to run it from the command line. Unlike using your trackpad to open an application to do something, you'll need to type a text command at the prompt (#) to tell fsck what to do. To use fsck:
1. Start up your computer in _single-user mode_ to reach the command line.
2. At the command-line prompt, type /sbin/fsck -fy
3. Press Return. fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it will display this message if no issue is found:
** The volume (nameofvolume) appears to be OK
If fsck found issues and has altered, repaired, or fixed anything, it will display this message:
*** FILE SYSTEM WAS MODIFIED ***
Important: If this message appears, repeat the fsck command you typed in step 2 until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
When fsck reports that your volume is OK, type reboot at the prompt and then press Return.
Your computer should start up normally and allow you to log in.
(This information is from the Apple Knowledge Base article entitled Resolve startup issues and perform disk maintenance with Disk Utility and fsck.)

New version of itunes wont download to my pc it keeps saying i have an invalid signature and stops the download. How can i fix this?

When i try to download the new version of itunes my computer says it cannot download and tells me to click the download only option. When i do this it then tells me the download has been stopped due to an invalid signature.
How can i fix this?

That one suggests the installer has gotten damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

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Since a few days ago, my computer is not downloading its updates and its says that the downloaded files may have been corrupted and although I download them again and again, it still says the same thing. Also my computer isnt reading the adobe flash player nor silverlight.

FrancisClass,
your image shows that three of these four updates have a “Restart” button rather than an “Update” button. After restarting your MacBook Pro, does Software Update still show you these same updates? If it does, are they shown with “Update” buttons, or with “Restart” buttons?
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Invalid Signature and corrupted files

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