SVN project C++ templates won't show up

I’m having issues working with our project on SVN.

I download the project through Tortise SVN and I’m able to open it up in the UE4 editor. From here, I try to add C++ code to the project by creating just a blank game mode. I debug the project, and the new UE4 window pops up, then I go to the world settings and attempt to change the game mode and my newly-created C++ class is not there.

What’s weird is I can do this in my tutorial project (non-SVN), but for some reason when I’m working with the SVN project this doesn’t work. Am I missing something? (running 4.5)