[Can't install v1.10.6 update on Windows]

I can't update to v1.10.6 on Windows, all 3 apps (Photo/Designer/Publisher) have the same problem. I get a Setup Failed message. It says "The cabinet file 'Main.cab' 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 this package."

I've tried rebooting, I've tried right clicking the .exe and running as Administrator, and I've tried redownloading in case the internet hiccuped. Nothing helps.

Any ideas how to fix this?

Thanks