Are you using non-English language on 3.16 by any chance?

I only have Win10, so can't try, unfortunately.

It might be an issue with the installer invoking the executable.

Can you both go here and then follow the PC link where it says: "Having problems...

Hi. It might be related to this:

http://www.shadowera.com/showthread.php?38284-3-16-Windows-Smartscreen-suddenly-not-recognizing-SE&p=594252&viewfull=1#post594252

Do you have any Firewall or...