UE 4.11 not detecting installed Visual Studio 2015


I’ve got one current install of UE 4.11, and it’s able to create and open C++ projects without issue.

However, recently a platform partner wanted us to work with a specific sample project of theirs… they provided the sample project, as well as a specific build of (what seems to be) UE 4.11.

When I use their UE build to open the sample project, I get a message that “To open this project you must first install Visual Studio 2015” (even though I’ve got VS2015 installed already). If I use my own previously-installed build of UE to open the sample project, I get a note that I’m missing modules (specific to the platform holder).

Any help would be greatly appreciated!