ITunes won't update- invalid signature- windows 8.1

The software takes forever to perform an auto update and then fails. So I chose to use Tools>download for a manual install and it gets approximately half way then gives an error message that it has an invalid signature and auto kills the download.

help ? no one ?

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I cannot update iTunes because when I run the Apple Software Updater, it says "'iTunes QuickTime' has an invalid signature. It will not be installed." If I try downloading only it says "'iTunes cannot update. Invalid signature.

I cannot update iTunes because when I run the Apple Software Updater, it says "'iTunes + QuickTime' has an invalid signature. It will not be installed." If I try downloading only it says "'iTunes cannot update. Invalid signature. Can someone help?

This forum is for questions from those managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. You'll be most likely to get help with this issue if you ask in the general iTunes for Windows forums.
Regards.

Keep trying to install update for itunes and keep getting 'invalid signature'

keep trying to install the new updates for itunes and keep getting 'invalid signature' and it won't download

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?

I get an error "iTunes + QuickTime" has an invalid signature while updating from 10.1 to 10.2.2

I get an error "iTunes QuickTime" has an invalid signature. The download has been removed. When trying to update from version 10.1 to 10.2.2. I have a Toshiba laptop running Windows 7 OS. I have tried repairing all the Apple software on the laptop. What do I need to do to get this updated?

I have not had this problem before but the latest update to iTunes + Quicktime, offered today, puts me in the same situation.
The web is covered with reports of this issue over the years, always "iTunes + Quicktime has an invalid signature", but nothing I can see which is a good fix for the problem.
Tried chkdisk, install manually doesn't work, the installer just keeps trying.
Tried installing QT 7.6.4 independently from the Apple download page, that didn't help either.
If this is so prevalent, why isn't there more on the main Apple site about it?

My iTunes won't update on my computer. I have windows vista. I can open iTunes and when I click "check for updates" it asks if I want to update to iTunes 11.1.5 and I click "Download iTunes" but then nothing happens. What's wrong?

My iTunes won't update on my computer. I have windows vista. I can open up itunes and when I click on "check for updates" it asks if I want to download iTunes version 11.1.5 and I click "Download iTunes" but then nothing happens. Sometimes uptop the loading bar will appear but for only a split second. I have tried restarting, shutting down, I cannot figure out why it won't download. What's happening and how do I fix it?

Try updating using an iTunesSetup.exe (or iTunes64Setup.exe) installer file downloaded from the Apple website:
http://www.apple.com/itunes/download/

My iTunes won't update, it starts to install then just says it can't. I decided to try uninstall it but it won't even uninstall anymore, there is some type of ERROR going on. I tried to just install iTunes from the website and that won't even work.

My iTunes won't update, it starts to install then just says it can't. I decided to try uninstall it but it won't even uninstall anymore, there is some type of ERROR going on. I tried to just install iTunes from the website and that won't even work. I'm using a Windows Vista.

Hi there,
I've got a couple of articles that may help you out. This first one goes over how to properly remove and reinstall iTunes.
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
This next one goes over some of the troubleshooting steps if you are having issues reinstalling iTunes.
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
Hope that helps,
Griff W.

8.2.1 error message "iTunes + Quicktime" has an invalid signature.

I am getting this error message when I am trying to download & install the 8.2.1 update. The entire message states "iTunes + Quicktime" has an invalid signature, it will not be installed. I saw another post started by Cfrolich, but it doesn't look like they got the problem fixed. Has anyone had this same error message? Can anyone help??

I have not had this problem before but the latest update to iTunes + Quicktime, offered today, puts me in the same situation.
The web is covered with reports of this issue over the years, always "iTunes + Quicktime has an invalid signature", but nothing I can see which is a good fix for the problem.
Tried chkdisk, install manually doesn't work, the installer just keeps trying.
Tried installing QT 7.6.4 independently from the Apple download page, that didn't help either.
If this is so prevalent, why isn't there more on the main Apple site about it?

ITunes won't update, unistall or re-install.

iTunes won't update or unistall. When I try, it says the installer source doesn't exist. When I tried to just reinstall it fresh, it says the old versions of Bonjour, iTunes and Quicktime can't be removed. Any solution for any of this?

Unfortunately, this sort of trouble has gotten more complicated to deal with ever since Microsoft pulled the Windows Installer CleanUp utility from their Download Center on June 25. First we have to find a copy of the utility.
Let's try Googling. (Best not to use Bing, I think.) Look for a working download site for at least version 3.0 of the Windows Installer CleanUp utility. (The results from mydigitallife and Major Geeksare worth checking.)
After downloading the utility installer file (msicuu2.exe), scan the file for malware, just in case. (I use the free version of Malwarebytes AntiMalware to do single-file scans for that.)
If the file is clean, to install the utility, doubleclick the msicuu2.exe file you've downloaded.
Now run the utility ("Start > All Programs > Windows Install Clean Up"). In the list of programs that appears in CleanUp, select anyiTunes, QuickTime and Bonjour entries and click "Remove".
Restart the PC, and try another iTunes install. Does it go through properly this time?

Itunes won't update, ipod unusable without it

I have an ipod touch. I have been really good about keeping my itunes up to date. The last version I updated to was early this year. It keeps telling me I need to update but that it failed to update after download and that I need to manually install.
I plugged my ipod in and it asked me to update the ipod software so I did. Then it tells me that the ipod won't work unless I have the 10.0.1. But when I go to itunes and download itunes 10.0.1 it downloads but won't install and tells me I have an invalid drive F:/. I don't even have a drive F. I can't use my ipod now, I turn it on and I have the picture of the ipod being plugged into itunes. But itunes won't update. Nothing online or in any thread I have found has given me a solution. I am very frustrated. Is there anything I can do? Or do I need to uninstall itunes and lose all my music and apps?

I just put a flash drive into a USB port and then it started the install and when it asked where I wanted to put it I changed it from drive F to C.

Itunes won't start up in Windows 7

iTunes won't start up in WIndows 7. Double click on it and it looks like it is going to start but nothing happens...

I am having the same problem. I didnt have quicktime on my computer, so i downloaded that and still not opening. I have re-installed it 3 times, restarted my computer multiple times. try'd launching in compatable mode (95,xp,and vista), tried running as admin, and have tried restoring previous versions,and now even those wont start. It was working fine, untill i installed the new update 2 days ago. i think it was update 11.0.1, im pretty sure i had 11.0.0
Any other suggestion?

"iTunes + Quicktime" has an invalid signature. It will not be installed.

What am I supposed to do???
I have tried and tried for weeks now.
1. a box pops up that says "Apple Software Update" and it says "New software is available from apple"
2. I click on "Install 1 Item"
3. I click on "accept"
4. It acts like its downloading...
5. "iTunes + Quicktime" has an invalid signature. It will not be installed.
and after i click okay it says if problem presists then click on tools>Download only...
i did that and it STILL SAYS THE SAME THING!!
HELP!?!?!?

I don't understand it ... but it works..
1. Get a POP-Up that says I need to update my Quicktime and iTunes players.
2. I click ok -- DO IT!!
3. I get the error -- "quicktime has an invalid signature".
3a. I google the phrase
4. I come here are read these pages ...
5. I go to microsoft,com and do not find SP3 for XP .. and think that the comments here are "right on" that is not the first choice .. gettting something "new" from Mr. Gates and his crew.
6. I go to apple.com ...download the files
7...... and all is well??!!!!
8.... wondering ...where does that pop-up come from that asks me to update ..?? if not from apple??!!
Oh Well ... Very happy now ... thank you all for taking the time to input...and educate this old man.
Respectfully,
CP

Itunes won't install on my windows 7, 64 bit puter.

itunes won't install on my windows 7, 64 bit puter. Repeated tries. It rolls back and cancels midstream.

Hello rotgerius
Check out the article below to troubleshoot issues with iTunes installing on your computer.
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
Regards,
-Norm G.

My itunes cannot be update on my windows xp. so i delete my itunes and install new, but now i got new problems, it says "The file itune.library.itl cannot be read because it was created by newer version of itunes." so how can it be solved?

my itunes cannot be update on my windows xp. so i delete my itunes and install new, but now i got new problems, it says "The file itune.library.itl cannot be read because it was created by newer version of itunes." so how can it be solved?

Hello Bebyida,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
http://www.apple.com/itunes/download/
Best of luck,
Mario

ITunes won't install on my windows 7 computer.

iTunes won't install onto my windows 7 computer. Any suggestions?

Hello, billymeck.
Thank you for visiting Apple Support Communities.
You may find this article helpful in troubleshooting the iTunes installation issue you are experiencing.
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
If iTunes has been previously installed, I would recommend completely uninstalling iTunes and all of it's components in the order specified in the article below. Once this is done, attempt a download and install iTunes.
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
http://support.apple.com/kb/HT1923
If you receive any errors when uninstalling, follow the steps in the article below.
"The feature you are trying to use is on a network resource that is unavailable" alert appears when removing Apple software in Windows
http://support.apple.com/kb/TS3704
Cheers,
Jason H.

My iTunes Won't update apps

My iTunes Won't update apps when i click check update it say"your iTunes library is up-to date"
awhen i check update From iPhone the it update all apps which are out dated

It sounds like you've already done the things that would fix most iPhones.
You can try restoring your iPhone.
If that doesn't do it, try contacting Apple through Express Lane. They may be able to gather some aditional logs and pinpoint the exact problem.

ITunes won't update- invalid signature- windows 8.1

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