Invalid signature problems pdating Itunes to 10.5 on WinXP

Since the Itunes 10.5 update was released, I have tried to update v.10.2 using the "Check for updates" menu command. Everytime I have tried to install the new version, and after doing everything short of uninstalling Itunes that the community has suggested, it will not download.
After the second of the three data packets are downloaded, I get the following error:
"Itunes has an invalid signature. It will not be installed."
Seeing the number of WinXP issues with Itunes 10.5, I think it is time a patch is created.
Anyone have any suggestions?

how you solve it? I have the same problem ;(

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Another Invalid Signature Problem

For the last few Itunes updates, I have received the "invalid Signature" message and whilst there are a lot of other people reporting this problem, I haven't seen a definitive answer. I am directly ethernet connected to my Linksys router and everything else downloads perfectly. I will try to use another machine to download the update and copy it but I was hoping for a real answer???
Paul Nol UK

A real answer would take some poking around in your particular model Linksys settings.
I saw one post about an MTU setting not matching between the router and the PC, but that was with a wireless setup, not ethernet like you have.
Frankly it would just be easier to download it from another PC, I think.
However, I'm curious if you can get a large download from any other site. The latest itunes DL is around 79MB. Adobe reader is about 49MB - does that go through?

Invalid Signature MSG Installing Itunes 11.4 - Windows 7

When will Apple fix the "INVALID SIGNATURE on the install of Itues 11.4 for a windows 7 pc ?
I have seen this post several times.
Apple does not always admit they have software issues.

Hi black3793,
Welcome to the Apple Support Communities!
I know it can be both frustrating and concerning when iTunes becomes unresponsive when you connect your iPod. In your situation I would start by isolating iTunes by uninstalling it and all of its components in the correct order and installing fresh. Please follow the steps in the attached article for removing iTunes and its components.
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
Remove iTunes and related components from the Control Panel
Use the Control Panel to uninstall iTunes and related software components in the following order and then restart your computer:
iTunes
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support (iTunes 9 or later)
Important: Uninstalling these components in a different order, or only uninstalling some of these components may have unintended affects.
Have a great day,
Joe

HT201413 Invalid signature when updating itunes and icloud, cancels update?

Apple software update cancels because of invalid signatures, what setting do I need to change?

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?

Help..error: invalid signature when updating itunes

I am trying to update my Itunes with current version but keep receiving error message that Itunes & Safari has an invalid signature and will not complete the update. Any advice?

Any body with a solution??

How do I fix the "Invalid Signature" problem?

I keep getting this error message everytime I try to update my software to 10.6.3. I've even tried the suggestion of a manual download and it still says the same thing. Does it make any difference to say that my iTunes and accompanying music are saved on an external hard drive? I've never had this issue before.

Go directly to Apple link to download
http://support.apple.com/kb/DL1426
Select "Save" instead of "Run". Once downloaded, double click the iTunessetup.exe or iTunessetup64.exe to install.

Attempting to install iTunes Version 10.5 and getting Invalid Signature. Can someone please help???

I am attempting to install iTunes Version 10.5. I am getting the following messages...
"Files shared by these updates" has an invalid signature. It will not be installed.
"iTunes" has an invalid signature. It will not be installed.
"Safari 5" has an invalid signature. It will not be installed.
I somehow got around this annoying "invalid signature" problem before by installing the iTunes update through the Apple site.
http://www.apple.com/itunes/download/
When I tried that, now I get...
"The installer encountered errors before iTunes could be configured. Errors occurred during installation. Your system has not been modified. Please run the installer again, or click Finish to Exit"
All this to get the latest iPhone software. And every blessed time I go to Sync my iPhone, I run into iTunes issue on my Dell PC here. I guess PC and Mac just cannot play well together.
Can someone PLEASE help me out here???
Thanks in advance for your help.
PSULionRP

Hi. I also had this problem when trying to connect a new iPhone 4S & it needed iTunes 10.5. Went to the Apple website as update section of iTunes was not getting any luck - went to downloads section of Apple website & downloaded the whole iTunes 10.5 program as though I did not have it in the first place (& also downloaded the programs for Quicktime 7.7.1 & Safari 4.0.3) ie not just the upgrades. I created a restore point in my Windows XP in case it all went pear shaped & then went ahead & installed all 3 programs. Opened iTunes at the end & all my music, apps, movies were all still there & now the new iPhone 4S works perfectly with the iTunes. Hope this helps.

Errror downloading iTunes: Invalid signature

I have been running an old version of iTunes with no problem & have just downloaded the new version 7.6? I got an error halfway thru the download "iTunes has an invalid signature it will not be downloaded". I carried on & the icon installed etc. & Quicktime tells me itunes is installed correctly, but when I try to launch it nothing happens. Has anyone got any suggestions. Tried un-installing & re-installing, running all my system scans & nothing works??

atvrcr500,
Have you tried connecting through a different router? That has solved the "invalid signature" problem for several folks.
Example:
http://discussions.apple.com/thread.jspa?messageID=10652940

Invalid signature, how to fix

cant install ois5, i get an invalid signature message updating itunes to 10.5

Please check this post out. I think you should be able to resolve your update process!
https://discussions.apple.com/message/22041796#22041796

Trying to update to iTunes 10.5, keep getting message "iTunes has an invalid signature. It will not be installed". Others are also posting this problem but can't seem to find any answers

Trying to update to itunes 10.5, keep getting message "iTunes has an invalid signature. It will not be installed". Others are also posting a similar problem but can't find any answers.

Please can anyone help on this

Problem updating itunes, keep getting invalid signature error message!!

Trying to update my itunes to latest version, keep getting "itunes has invalid signature" error message, any ideas of how to remedy this?
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Meerkat68

I've had this problem for awhile in Windows XP SP3. Last night, the simplest thing occurred to me...here's what I did (and I'm telling because it worked).
1. Clicked on Start
2. Clicked on Control Panel
3. Chose Add/Remove Programs
4. Found Apple Software Updater and clicked Remove, then responded Yes
5. Went to apple.com and clicked on Support, and then Downloads
6. Downloaded the latest version of Safari ONLY
7. Installed Safari (knowing it would install the latest version of Apple Software Update)
8. AFTER the installation was complete, I clicked again on Start, then All Programs
9. then, clicked on Apple Software Update

I'm having a problem updating the iTunes software. Receiving "invalid signature". Does anyone know how to fix this?

Hi Everyone,
I have been trying to update iTunes, Safari, and Quicktime. Keep receiving "invalid signature" and then it removes the attempted download. Does anyone know how to fix this?

I have had this happen as well. What I had to do was sync the iPod to remove the album and the resync the album back to the Classic. I've had this happen with my iPhones as well. Must be a bug in either the current OS or iTunes versions.

When I try to download the latest version of iTunes on my iPod Classic I get the message that "iTunes has an invalid signature" and that "Content was blocked because it was not signed by a valid security certificate. Anyone know how to fix this?

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.

I run Windows 7 and the newest version (10.6) of iTunes will not install. The installer won't even begin, and when I run the Apple Software update, it tells me that iCloud and iTunes have invalid signature.

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Ok, so after like 4 days of going through all these different issues, I figured out that several programs weren't downloading, and it was an issue with my wireless connectivity messing up the digital signatures, so if you plug in your comp to the modem and delete your temp files, it should start to work!

I am getting "invalid signature" error when i try updating itunes. How do I fix?

I received a notice that an update was available for itunes. I went through the installation
process and then near the end an error message came up telling me that it would not be installed
because of an invalid signature I tried doing this again only manual this time and the same thing happened.
I have never had this happen before. What is the problem? How do I fix?
Thanks, JKay

Twanger317,
Have you tried to do a repair install on the pc of iTunes? Also if that does not work i would follow these instructions on removing iTunes and reinstall. http://support.apple.com/kb/HT1923 for windows vista and 7 and http://support.apple.com/kb/HT1925 for windows xp. let me know if that helps.

Invalid signature problems pdating Itunes to 10.5 on WinXP

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