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?

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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?

"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

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.

ITunes & Quicktime has an invalid signature. The program has been removed

When I try to update itunes through the apple software update, i get error message 'itunes and quicktime has an invalid signature. the program has been removed.'
When I go to download from the apple website.. it downloads 10% and then stops.
I have tried downloading through google chrome, firefox and IE, I have tried to delete my temp file, And I have also gone into internet options and ticked 'allow software to run or install even if signature is invalid'.
Nothing is working!!! Does anyone know how to fix this?

Okay. Try downloading and saving the installer onto a different PC. Copy the iTunesSetup.exe (or iTunes64Setup.exe) onto a USB key or thumb drive or other external drive (or even burn it to a CD) and then carry it to your PC. Copy the installer onto your internal hard drive, and then start the install by doubleclicking the iTunesSetup.exe (or iTunes64Setup.exe).
(If we can get a working copy of the installer onto a PC, installs will usually go through without the invalid-signature/not-valid-win32/unknown-publisher/etc errors.)

Error installing iTunes + Quicktime 7.4.1

I'm trying to update to version 7.4.1 for a new iPod Shuffle but halfway through the installation I get this error "iTunes + Quicktime has an invalid signature. It will not be install". Please help.

I had similar issues when upgrading to 7.4.1 within iTunes. So I tried it within Quicktime and it worked fine. Maybe that route can work for you? Cheers.

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 ?

"iCloud for Windows" has an invalid signature. It will not be installed.

09-22-2014
I tried installing the update for iCloud on Windows. I received the following error:
"iCloud for Windows" has an invalid signature. It will not be installed.
I tried to install again but received the same error message. How do I fix this?

I tried to do just the download but I got this error:
"iCloud for Windows" has an invalid signature. The download has been removed.

Firefox Displays "Peer's certificate has an invalid signature." SubCA shows "Could not trust this certificate for unknown reasons"

Using a 2-tier on-premise PKI. Offline Root CA (Standalone Windows 2008 R2 Enterprise) and online SubCA for issuing certificates (Domain-Joined Issuing CA)
ROOTCA certificate installed in the store and showing trusted (Uses a SHA2 signature and PKCS #1 SHA-256 With RSA Encryption algorithm)
ISSUINGCA certificate installed in the store and showing "Could not trust for unknown reasons" also has SHA2 signature with RSASSA-PSS algorithm
Issued certificate is for a Lync Front-End Web Server and when attempts are made to load the secure web connection. I receive the error "Peer's certificate has an invalid signature"
I've completely de-installed and re-installed Firefox. Removed and re-added the ROOT and SUBCA certs. Note: No issues when using same certs in Internet Explorer 8, 9 or 10 on the same system. Lync client also using same certificates, no issues. Only when accessing the Lync Web Services from Firefox.
Question: Does Firefox NSS Internal PCKS#11 Module support RSASSA-PSS SHA-256 with different hashes? How can I troubleshoot this further?

HI khetheri,
In order to better test the certificate may we request the certificate without the private keys? I have some backup from the security team if this is possible.
There is a temporary work around as well but I don't recommend turning on all certificates to make sure it is not a compatibility error(ish)
It is possible to check if it is being detected as a bad certificate in Firefox itself to eliminate compatibility issues.
# In the [[Location bar autocomplete|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear.
# Click '''I'll be careful, I promise!''', to continue to the about:config page.
# Search for '''browser.xul.error_pages.expert_bad_cert ''' and set it to true to try the certificate normally.
Looking forward to your reply!

ERROR MESSAGE: ITUNES HAS STOPPED WORKING

Hi guys n girls, i was wondering if antonehas had the same probs as me, and ill try to explain what happens, After buying an ipod classic 120gb, i downloaded itune 8 for the firs time and it installs, then windows installer asks you "wouldyou like to open itune" so, i click yes, i set it all up, sort out a library, sync to ipod which is all fine, ipod works great.. Now if i close itunes, and open it again another time i get an error message,"itune has stopped working and windows is looking for solutions" and this does it evertime i click onto the icon and the quicktime icon aswell. now ive remove all of itune, quicktime, bonjour, apple updater and mobile support includeing a file to do with apple including some of the music that becomes attactched to it and checking system 32.i then download a fresh itues, it installs, works for the first time and thats it, i get the message again. i have uninstalled and installed intune including various products several time but to no sucess with getting itune to work. if anyone can possibly help me with this as ipod dont bounce off of walls very well cheers
bazza
bazdonsop

please sombody help me, apple support are no help, the shop are no help, the only thing i havent tried is delete everything on my laptop and put it back to factory, which is my very last resort

I am trying to upgrade to iTunes 11.4 and get an error message that says " iTunes has an invalid signature. It will not be installed" How do I fix that?

I am trying to upgrade to iTunes 11.4 on my Windows7 PC and get an error message that says " iTunes has an invalid signature. It will not be installed" How do I fix that?

Hi curliejo,
Welcome to the Apple Support Communities!
In your situation I would recommend the steps in the following article for troubleshooting iTunes. It may be necessary to completely remove and reinstall iTunes in this situation. Be sure to remove all of the components with iTunes in the correct order as outlined in the article before installing fresh.
Issues installing iTunes or QuickTime for Windows
Have a great day,
Joe

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

Error message -ITunes has detected a problem with your audio config...HELP

error message - itunes has detected a problem with your audio configuration. audio/video playback may not operate properly...
ive gone through the itunes support steps such as reinstalling quicktime and itunes and nothing seems to work... itunes still open...but then nothing plays...please help me

I've cobbled together a few ideas courtesy of some posts made by the inimitable b noir concerning this particular problem .
First ...
... let's try swapping out your QuickTime, taking a few additional explicit precautions this time.
head into your Add/Remove programs. uninstall QuickTime.
Next, we’ll manually remove any leftover program files and folders.
1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).
2. In My Computer, open Local Disk.
3. Open Program Files.
4. Right-click on the QuickTime folder and click Delete from the shortcut menu.
5. Navigate to C:\Windows\system32\.
6. Remove the files QuickTime.qts and QuicktimeVR.qtx.
7. Restart your computer.
next, we'll get a fresh copy of QuickTime into your PC by doing a repair install of itunes.
switch off antivirus and antispyware applications prior to the repair install.
go into Add/Remove and select itunes. click "Change" and then click "Repair".
if the repair install goes through okay, restart the PC and try launching itunes again. does it launch properly now?
Next ...
If you're still getting the message with a fresh quicktime in place, let's check to see if something is awry with your sound card.
Open your "Sounds and Audio Devices" control panel. Click the "Audio" tab. Is the correct default device showing up in the "Sound Playback" area?

I recently tried to update iTunes to 11.1, and am now getting an error message "This application has failed to start because MSVCR80.d11 was not found." I have uninstalled and reinstalled iTunes multiple times. Am running Windows XP Svc Pack 3. help

I recently tried to update iTunes to 11.1, and am now getting an error message "This application has failed to start because MSVCR80.dll was not found. Reinstalling the application may fix this problem." I have uninstalled and reinstalled iTunes several times with no success. I am running Windows XP Svc Pack 3. Help please.

Click here and follow the instructions. You may need to completely remove and reinstall iTunes and all related components, or run the process multiple times; this won't normally affect its library, but that should be backed up anyway.
(99753)

Help! my windows PC with Vista will not dowload itunes 10.7. It gives me an error message: Your system has not been modified

Help! my windows PC with Vista will not dowload itunes 10.7. It gives me an error message: Your system has not been modified.I
I have tried unistalling the current version I had which was 10.6.3, defragging and running a security scan. Now, the highest version I can get is 10.4.1. for some reason I cannot dowload itunes 10.5 or higher as it gives me the same message which is what I need to connect and update my iphone. Anyone facing the same issue or can point me in the right direction?

You may get better information on that error message by reposting in the iPhone forums:
iPhone
It's also possible that newer iPhone updates want an OS higher than Tiger. Post the specs of your computer and we can see if an OS upgrade is possible. There are a large number of G4 variants with different capabilities, so giving us something more than just "G4" will get you help faster.

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

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