I keep getting invalid signature when trying to upgrade to 10.5 from 10.4.1.10

I've tried to install 10.5 numerous times and keep getting "invalid signature" error even after doing the suggested Apple Software Update 'repair' as well as doing the download and running the install manually.
I now have updates piling up on my iPad2 as I can't sync to install ios5.......................  Not happy!

Click here and download the software. Unless otherwise noted, a device running iOS 6 requires at least Mac OS X 10.5.8 and iTunes 10.6.3 to be synced from a Mac.
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