Possible to use Visual Studio 2017 with pre 4.15 projects?

They added official support for VS 2017 in version 4.15 and later, and when I use an earlier version of Unreal it tries to install VS 2015, is there a way to have it use VS 2017 or do I just have to run VS 2015 alongside it for older projects?

Thanks in advance for any help!