Error adding reference in SSIS

Hello all. I am trying to write a SSIS script task to call WinSCP. I have downloaded and installed the assembly, registered it in windows, and installed it to the GAC. As per the posted instructions. However, when I try to add a reference to the dll I get the following error.

No Visual studio template information found. See application log in Event viewer for more details.

A little bit of research told me to try to run devenv /installvstemplates through the VS command prompt but that didn't help. Anyone with some more information? Thanks in advance.

Matt