Changing the name of the SteamVR folder seems to have fixed this issue for me
-My SteamVR was located in "C:\Program Files (x86)\Steam\steamapps\common"
-locate the SteamVR folder and rename it. This will just be temporary, I simply put an "a" at the end changing it to "SteamVRa"
-Now the game pack shouldn't detect the SteamVR and should run normally on flatscreen, hope this helps!
be sure to change the name of the folder back when you want to play VR