FWIW I just downloaded BB build431 using IE11 build 11.0.9600.18163 on Windows 7 Home Premium x64 and I got the same signature warning as reported here.

I then downloaded the build431 file again but using Firefox build 5.4.2, saving to a different location and had no issues or warnings, but I installed the one I downloaded using IE11 (the one that gave me the signature warnings) and it installed just fine and BiaB seems to Work as it should, so I don't think you need to worry.

If you're on Windows 10 Things might be different though. I don't run BiaB on my Win10 PC so I can't verify that.

Hope this helps!

Ole

Last edited by SteelPlayer; 01/15/16 09:42 AM.