Hi Roland;
I normally use FireFox for downloading and have never had an issue form SourceForge. However, I just tried using Chrome v46.0.2490.71 and it worked flawlessly. I suspect that the problem is on your end with maybe some malware like the Conduit Toolbar, your particular anti-virus, etc.
As far as the Foundation Classes and their example applications - they all identify the associated PB type, version and build number in both their included read-me file and and the download file name itself, for example: STD_FC_Integrated_v2015.4.1.45_Classic_12.1.0_B6518_2015-10-06 or STD_FC_PB2Java_2015.1.0.1_PB12.1_Classic_B6518_2015_10_08
HTH
regards ... Chris