"Invalid signature" downloading iTunes 8.2.1

I was running iTunes 8.02 on my Toshiba laptop. After copying my iTunes files from my netbook (which is running iTunes 8.1.1 on Windows XP) to my Toshiba (Windows Vista), I could not run the older version because the itl library is a newer version. I don't want to have to recreate all my work (1200 songs, and about 20 playlists), so I tried to download the newest version, 8.2.1 onto my laptop. The first two times, I did the usual process, and it failed to install. The third time, I tried downloading manually, but after all the time downloading, I got a message that there was an "invalid signature," and it was deleting the download file.
Can anyone help? Thank you!

Try this solution from Katrina :
Katrina S.
Posts: 20,498
From: USA
Registered: Dec 27, 2004
Re: iTunes 8.2 has in invalid signature?
Posted: Jun 21, 2009 1:13 AM in response to: cfrolich
Click to reply to this topic Reply email Email
Try going into IE > Tools > Internet Options > Advanced tab
Scroll down to the security section
Put a check in the box for "Allow software to run or install even if the signature is invalid"
SAVE the iTunesSetup.exe, it's a bad idea to run installs over the internet.
If this works, go back into IE and change that box back to being unchecked when you are through.

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