Digital Signature Incorrect?

In the process of updating my iTunes software (using Software Update from Preferences) to the latest version 8.2.1 I received this message ...
The update “itunes” can’t be installed.
The digital signature for this package is incorrect. The package may have been tampered with or corrupted since being signed by “Apple.”
I note I've had recent similar problems when attempting earlier upgrades including the latest “Security Update 2009-003 (PowerPC)” upgrade.
After looking through this forum it was suggested that one should download the latest version of iTunes directly from the Apple download website at http://www.apple.com/itunes/download/ and try the install again.
I did that and completed the download of the iTunes8.2.1.dmg file to my desktop but, when I clicked on it to install I received the following message ...
The Following disk images failed to mount
iTunes8.2.1.dmg – Reason: invalid checksum
What's up with that? Suddenly I'm unable to update any of my software without receiving at least one of the above two messages?
Any ideas how to fix the problem?
Thanking you in advance.
Rick

I am having this trouble with several updates I've been trying to do with an eMac onto which I just installed 10.4 from scratch. The 10.4.11 combo updater wouldn't download or install because the verification check failed. I figured out a way around THAT, but now iTunes won't install, and java updates fail via Software Update for the same reason. I've been doing this for a lot of years and I've never seen this happen before!

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Mac OS 10.5.8 update combined can't be saved, Apple digital signature incorrect.

Hi,
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refuses to save with the following message. 2.16 GHz + 2 GB ram.
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Hello, it's generally one of two thinks that cause this, but it is a bad download.
Try Ethernet instead of Airport if possible.
Disk can be corrupted...
Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
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Thank you for replying to my post.
Yes, I can do a nozzle check with the USB unplugged,
and I still get poor results on the C82 and nothing
on the C86. I just can't believe both printers are
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Epsons are notorious for getting their print heads clogged. Run the clean print head routine a few times. If that doesn't work, return the new printer 'cause it's dead out of the box. The old printer, well, once Epson print heads get to a certain level of clogging, nothing will unclog them. Toss the printer and get a new one. Hint: HP and (some) Canon printers put the print heads in the ink cartridges, while Epson and (some) Canons have the print heads in the printers. Machines which have the heads in the carts also have an easy fix for severe clogs: toss the cart. Warning: HP printer drivers stink.
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I wish I could afford to just buy another printer.
But I'm still worried it's something to do with my
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I have several update packages that were consistently reporting the error:
*The update "xxxxxxx" can't be saved.*
The digital signature for this package is incorrect.
The updates are:
iLife Support 9.0.3
Java for Mac OS X 10.5 Update 4 1.0
Safari 4.0
Several other updates (eg. recent iTunes and QuickTime) downloaded and installed OK.
I tried all of the following to no avail:
Repair disk permissions
Reinstall 10.5.7 combo package manually
Delete Software Update preferences & cache files
Multiple restarts
Finally I tried running Software Update under a fresh admin account and they downloaded OK. (Different issue that the Java Update later said it couldn't install).
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I tried all of the following to no avail:
Repair disk permissions
Guess Carolyn didn't notice this.
This was happening fairly frequently about a month ago when 10.5.7 came out. The Apple servers were overloaded apparently and some incomplete downloads occurred so some type of checksum prevented running the update. Waiting and downloading later seemed to be the best solution.
http://discussions.apple.com/thread.jspa?messageID=9456350&#9456350
So seemingly this is related to something in my usual admin account. Does anybody know what other preference files I should look to delete, or any other hidden setting that is affecting the digital signature checking?
Perhaps by the time you did all the troubleshooting steps, if you tried it from the original admin account it would have downloaded correctly.

Digital Signature Incorrect / Coddec Overrun possible Solution please read!

Ok Ive posted this under a few topcis. I will go over my issue and I hope this will help others out there having the same issue.
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2 PC's
1 Mac mini
1 Netgear Wireless Router WGR614V6
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What if you do this:
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In iTunes, select the device icon in the Devices list on the left. Click the Photos tab in the resulting window.
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Choose "Selected albums" and deselect the albums or collections you want to delete.
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Copy music
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I have completed a clean install and have installed OS 9.2 as well as OS 10.3
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Hi, Harold and baltwo —
(1) Harold, I agree with baltwo's advice to try using "stand-alone" downloads as a short-term "work-around." But I realize this may be unsatisfying — if the error becomes chronic.
(2) baltwo's advice to search Apple's KnowledgeBase is normally a very useful resource — but in this instance, only provides links to a few articles about the topic as it relates to OS 9, Mail.app, and OS X Server. If you'd like to read background info about the current usage of digital signatures, you'll find info that's a bit more relevant from:
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Please post back to discuss your progress.
Good luck!
Dean

Software update-"incorrect digital signature"

I've used software update many times. Today, when attemting to use software update I get the following error message:
"the digital signature for this package is incorrect. the package may have been tampered with or corrupted since being signed by apple"
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thanks,
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Since we don't know where the O.P. is located or why the digital signature is incorrect, I suggest taking the added precaution of verifying the SHA-1 Digest for at least the first of the manually downloaded updates if that method of obtaining them is used.

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The digital signature of this package is incorrect. The package may have been tampered with or corrupted since being signed by Apple.
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WTFudge?

I had forgotten about this. I got absolutely no help from Apple (electronically or at Apple bar) where I bought it. Its sits in the basement and the kids play on it. Unfortunately their iPods dont even work on it, as it wont update iTunes now. I replacedit with a custom built PC running Microsoft. Unfortunately it was a 1500.00 mistake that I won't make again.

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The digital signature for this package is incorrect.

im trying to do a software update and i get The digital signature for this package is incorrect. The package may have been tampered with or corrupted since being signed by “Apple”. how do i fix it?

Are you using Software Update, or direct download?
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Hello to all,
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Hi,
I'm not sure if this helps, but I found something unusual with your PDF2. Just at the beginning of the second incremental update (with the new signature), the first object is added without a carriage return. This make the last line of the previous update looks like this:
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Adobe Acrobat 9.3 has encountered a problem and needs to close. We are sorry for the inconvenience.
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Steve

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