ITune 12.1 update fail by showing invalid signature

I cannot download iTune 12.1 in both download only and download and install options by using Apple Software Update even I have iTune with valid ID in my computer. The download has never finished, showing invalid signature.
Any good reason and help.

Hey mewinkoko,
If you are having an issue with installing an update to iTunes for Windows, I would suggest that you troubleshoot using the steps in this article -
If you can't install or update iTunes for Windows - Apple Support
Thanks for using Apple Support Communities.
Happy computing,
Brett L

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I tried to update to the most recent itunes, but the update failed and now when I try to open itunes a dialog box pops up and tells me that it can.t open because MSVCR80.dll is missing. I need help!

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Solving MSVCR80 issue and Windows iTunes install issues.
Thanks to user turingtest2 for this solution.
Solving MSVCR80 issue and Windows iTunes install issues.
If the above doesn’t do the trick entirely, then use the instructions in the following as it applies to the version of Windows you are using:
HT1925: Removing and Reinstalling iTunes for Windows XP
HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
You may be required to boot into safe mode to complete the folder deletion process.

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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?

I was told to update iTunes. The update failed. Now I can't open iTunes but get the following messages: The program can't start because MSVCR80.dll is missing from your computer. Try reinstating the program to fix this problem. Then I get iTunes was not

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Troubleshooting issues with iTunes for Windows updates - MSVCR80

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Download the Windows Installer CleanUp utility from the following page (use one of the links under the "DOWNLOAD LOCATION" thingy on the Major Geeks page):
http://majorgeeks.com/download.php?det=4459
To install the utility, doubleclick the msicuu2.exe file you downloaded.
Now run the utility ("Start > All Programs > Windows Install Clean Up").
In the list of programs that appears in CleanUp, select any QuickTime entries and click "Remove", as per the following screenshot:
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I have been trying to install the update from iTunes 12.0.1 to iTunes 12.1. For some reason the update fails and I seem to be stuck with iTunes 12.0.1 and the app store telling my permanently that I need the update.
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As Peter says, iTunes 12.0.1 is the latest.
Can you post a picture of this message from the App Store?
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I'm trying to download the newst update of iTunes for my Ipod Touch. I continually receive the 'invalid signature'. Why? How can I correct that and then update my unit?

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I would delete the download and redownload the updat file. It is located here for a PC
ipsw location
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Hi vikashmetals,
Here is an article of steps for trouble installing iTunes:
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/ht1926
Have a good one,
- Ari

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Software Update fails and shows errors in console (No Leopard 10.5.3)

I have a MacMini with Leopard installed with boxed DVD last november (upgrade from Tiger).
Every update (apps and system went fine since them).
I haven't got the java update 6 since my processor is a Core Duo and not a Core 2 Duo.
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Neither the direct downoad of Combo of Delta update are not OK to install on my system.
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"You cannot install Mac OS X Update Combined on this volume. This volume does not meet the requirements for this update."
Anyone can help?
Thanks.
The install.log is:
May 29 20:34:13 yugo Software Update[2345]: JS: 10.5.2
May 29 20:34:17 yugo Software Update[2345]: Found receipt (id match) for ((null) / com.apple.pkg.ProAppRuntime): (ProAppRuntime / com.apple.pkg.ProAppRuntime)
May 29 20:34:17 yugo Software Update[2345]: Found receipt (name match) for (ProAppRuntime / com.apple.pkg.ProAppRuntimeSU): (ProAppRuntime / com.apple.pkg.ProAppRuntime)
May 29 20:34:17 yugo Software Update[2345]: Found receipt (name match) for (ProRuntime / com.apple.pkg.ProRuntimeSU): (ProRuntime / com.apple.pkg.ProRuntime)
May 29 20:34:17 yugo Software Update[2345]: Found receipt (id match) for ((null) / com.apple.pkg.ProRuntime): (ProRuntime / com.apple.pkg.ProRuntime)
May 29 20:34:17 yugo Software Update[2345]: JS: 10.5.2
May 29 20:34:17: --- last message repeated 1 time ---
May 29 20:34:17 yugo Software Update[2345]: Package Authoring Error: installation-check results requires a message
May 29 20:34:17: --- last message repeated 4 times ---
May 29 20:34:17 yugo Software Update[2345]: Found receipt (name match) for (AppleIntermediateCodec / auto): (AppleIntermediateCodec / com.apple.pkg.AppleIntermediateCodec)
May 29 20:34:17 yugo Software Update[2345]: Found receipt (name match) for (QuickTimeBroadcaster / a): (QuickTimeBroadcaster / com.apple.pkg.QuickTimeBroadcaster)
May 29 20:34:18 yugo Software Update[2345]: Found receipt (full match) for (BatchMonitor / com.apple.pkg.BatchMonitor): (BatchMonitor / com.apple.pkg.BatchMonitor)
May 29 20:34:18: --- last message repeated 1 time ---
May 29 20:34:18 yugo Software Update[2345]: JS: model = Macmini1,1
May 29 20:34:19 yugo Software Update[2345]: JS: 10.5.2
May 29 20:34:19: --- last message repeated 1 time ---
May 29 20:34:19 yugo Software Update[2345]: Found receipt (full match) for (PluginManager / com.apple.pkg.PluginManager): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:19 yugo Software Update[2345]: Found receipt (name match) for (PluginManager / autoPluginManagerSU): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:20 yugo Software Update[2345]: JS: 10.5.2
May 29 20:34:20: --- last message repeated 1 time ---
May 29 20:34:20 yugo Software Update[2345]: Found receipt (name match) for (RemoteDesktopClient / b): (RemoteDesktopClient / com.apple.pkg.RemoteDesktopClient)
May 29 20:34:20 yugo Software Update[2345]: Found receipt (name match) for (RemoteDesktopAdmin320 / b): (RemoteDesktopAdmin320 / com.apple.pkg.RemoteDesktopAdmin320)
May 29 20:34:20 yugo Software Update[2345]: Found receipt (name match) for (AirPortExtremeUpdate2007002 / auto): (AirPortExtremeUpdate2007002 / com.apple.pkg.AirPortExtremeUpdate2007002)
May 29 20:34:20 yugo Software Update[2345]: Found receipt (full match) for (iPhoto_606 / com.apple.pkg.iPhoto_606): (iPhoto_606 / com.apple.pkg.iPhoto_606)
May 29 20:34:20 yugo Software Update[2345]: Found receipt (name match) for (WebObjects5.3.3Update / auto): (WebObjects5.3.3Update / com.apple.pkg.WebObjects5.3.3Update)
May 29 20:34:24 yugo Software Update[2345]: Found receipt (name match) for (AirPortExtremeUpdate2007003 / auto): (AirPortExtremeUpdate2007003 / com.apple.pkg.AirPortExtremeUpdate2007003)
May 29 20:34:24 yugo Software Update[2345]: Found receipt (full match) for (ProAppsEffects / com.apple.pkg.ProAppsEffects): (ProAppsEffects / com.apple.pkg.ProAppsEffects)
May 29 20:34:24 yugo Software Update[2345]: Found receipt (name match) for (PluginManager / autoPluginManagerSU): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:24 yugo Software Update[2345]: Found receipt (name match) for (ProAppsEffects / ProAppsEffects): (ProAppsEffects / com.apple.pkg.ProAppsEffects)
May 29 20:34:24 yugo Software Update[2345]: Found receipt (full match) for (PluginManager / com.apple.pkg.PluginManager): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:24 yugo Software Update[2345]: Found receipt (name match) for (FrontRowUpdate1.3.1 / auto): (FrontRowUpdate1.3.1 / com.apple.pkg.FrontRowUpdate1.3.1)
May 29 20:34:24 yugo Software Update[2345]: JS: Firmware is up to date.
May 29 20:34:25 yugo Software Update[2345]: Found receipt (name match) for (AirPortExtremeUpdate2007004 / auto): (AirPortExtremeUpdate2007004 / com.apple.pkg.AirPortExtremeUpdate2007004)
May 29 20:34:25 yugo Software Update[2345]: Found receipt (full match) for (iMovie_710 / com.apple.pkg.iMovie_710): (iMovie_710 / com.apple.pkg.iMovie_710)
May 29 20:34:25 yugo Software Update[2345]: Found receipt (name match) for (QT72CompatibilityUpdate / auto): (QT72CompatibilityUpdate / com.apple.pkg.QT72CompatibilityUpdate)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (id match) for (Software Update / com.apple.pkg.QuickTimeBroadcaster): (QuickTimeBroadcaster / com.apple.pkg.QuickTimeBroadcaster)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (QuickTimeBroadcaster / auto): (QuickTimeBroadcaster / com.apple.pkg.QuickTimeBroadcaster)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (ProAppsEffects / autoProAppsEffectsSU): (ProAppsEffects / com.apple.pkg.ProAppsEffects)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (PluginManager / autoPluginManagerSU): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (full match) for (ProAppsEffects / com.apple.pkg.ProAppsEffects): (ProAppsEffects / com.apple.pkg.ProAppsEffects)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (full match) for (PluginManager / com.apple.pkg.PluginManager): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (QuickTime745_Leopard / auto): (QuickTime745_Leopard / com.apple.pkg.QuickTime745_Leopard)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (PluginManager / autoPluginManagerSU): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (id match) for (Software Update / com.apple.pkg.PluginManager): (PluginManager / com.apple.pkg.PluginManager)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (iTunesAccess / iTunesAccess): (iTunesAccess / com.apple.pkg.iTunesAccess)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (AppleMobileDeviceSupport / amds): (AppleMobileDeviceSupport / com.apple.pkg.AppleMobileDeviceSupport)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (iTunesX / iTunes): (iTunesX / com.apple.pkg.iTunesX)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (AirPortUtility / a): (AirPortUtility / com.apple.pkg.AirPortUtility)
May 29 20:34:26 yugo Software Update[2345]: Found receipt (name match) for (AirPortUtility_Leopard / a): (AirPortUtility_Leopard / com.apple.pkg.AirPortUtility_Leopard)
May 29 20:34:27 yugo Software Update[2345]: Found receipt (name match) for (FrontRowUpdate2.1.3 / auto): (FrontRowUpdate2.1.3 / com.apple.pkg.FrontRowUpdate2.1.3)
May 29 20:34:27 yugo Software Update[2345]: Found receipt (name match) for (SecUpdQuickTime716 / auto): (SecUpdQuickTime716 / com.apple.pkg.SecUpdQuickTime716)
May 29 20:34:27 yugo Software Update[2345]: JavaScript error "Undefined value" while running "_choice_suvisible"
May 29 20:34:27 yugo Software Update[2345]: _choice_suvisible returned error: Undefined value
The install.log for the combo package :
/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer[2384]: vm_allocate: 0, 0x5000000 - 0x25000000
/System/Library/CoreServices/Installer.app/Contents/MacOS/Installer[2384]: vm_protect: 0
Installer[2384]: @(#)PROGRAM:Install PROJECT:Install-378
Installer[2384]: @(#)PROGRAM:Installer PROJECT:Installer-278
Installer[2384]: Hardware: Macmini1,1 @ 1.66 GHz (x 2), 2048 MB RAM
Installer[2384]: Running OS Build: Mac OS X 10.5.2 (9C7010)
Installer[2384]: Env: PATH=/usr/bin:/bin:/usr/sbin:/sbin
Installer[2384]: Env: TMPDIR=/var/folders/Y4/Y4sMCsAIE58cyYkAJi5FfU+TI/-Tmp-/
Installer[2384]: Env: SHELL=/bin/bash
Installer[2384]: Env: HOME=/Users/thierry
Installer[2384]: Env: USER=thierry
Installer[2384]: Env: LOGNAME=thierry
Installer[2384]: Env: DISPLAY=/tmp/launch-2C4GnV/:0
Installer[2384]: Env: SSHAUTHSOCK=/tmp/launch-5LZwpK/Listeners
Installer[2384]: Env: ApplePubSub_SocketRender=/tmp/launch-65XpRu/Render
Installer[2384]: Env: _CF_USER_TEXTENCODING=0x1F5:0:1
Installer[2384]: Env: SECURITYSESSIONID=cb6620
Installer[2384]: Env: COMMAND_MODE=unix2003
Installer[2384]: Mac OS X Update Combined Installation Log
Installer[2384]: Opened from: /Volumes/Mac OS X Update Combined/MacOSXUpdCombo10.5.3.pkg

I'm also receiving SU console error messages - irrespective of whether SU is run from the menu, automatically on its weekly schedule, or logged into the computer using a different user.
Any ideas?
Here are my console messages:
5/26/08 12:25:13 pm Software Update[184] Package Authoring Error: installation-check results requires a message
5/26/08 12:25:13 pm Software Update[184] Package Authoring Error: installation-check results requires a message
5/26/08 12:25:13 pm Software Update[184] Package Authoring Error: installation-check results requires a message
5/26/08 12:25:13 pm Software Update[184] Package Authoring Error: installation-check results requires a message
5/26/08 12:25:13 pm Software Update[184] Package Authoring Error: installation-check results requires a message
5/26/08 12:25:20 pm Software Update[184] JavaScript error "Undefined value" while running "_choice_suvisible"
5/26/08 12:25:20 pm Software Update[184] _choice_suvisible returned error: Undefined value

Itunes 12.01 update fails

Hmmm What gives?
I updated Itunes to 12.01 several times on my Yosemite Macbook, but the update ends, and iTunes keeps sitting at 12.00.140.
No error message, no nothing, just a big table of "updates" in my App Store, but none of them seems to have gotten through; itunes and the App Store are still mentioning that there are updates available, but I can't seem to be able to update completely
Any clues?
Jan-Joost

Hi Jan-Joost,
I was having the exact same problem. I found this solution on another thread, tried it and it worked. The iTunes download that is coming from the App Store must be corrupted. Go to Apple.com and find the "download iTunes now" page and download it directly from there. Take it from your "Downloads" folder and install as normal.

ITune 12.1 update fail by showing invalid signature

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