Microsoft Visual Studio 2014

I have had Vissim 8.0 for some time and had only recently though of creating custom blocks.

I discovered that I had not had Microsoft Visual Studio on my computer when I loaded Vissim on it so it. I have loaded Microsoft Visual Studio 14 (Visual Community 2015 (free version) but Vissim is not recognizing it. I tried re-loading Vissim on to my computer as well and it was not recognizing it.

How can I best get these two programs talking?