New version installation bug: corrupt CAB, error 2350

I'm unable to install the latest update. I'm able to download most of it, but then I get the error message "A CAB file required for this installation is corrupt and cannot be used. This could indicate a network error, an error reading from the CD-ROM, or a problem with the package." with the options to cancel, retry, and ignore. Retry just brings up the same error message, while ignore gets "Internal Error 2350." and installation fails.

Any help out there?