Hi,
The same thing has happened to me: just tried to download update 431 three times; third time after rebooting. Message is "The signature of bb2016_update_built431.exe is corrupt or invalid." I think the problem is in the code on PG's end not my browser.
Using Win7 Pro and the latest MS Internet browser.
Sonny Ray - quick question...
Did you download the previous build - 430? Without a problem? When?
If you did and did not have problems, it could be an issue with the latest updates to Windows - or the latest definitions files (for virus checking)