Posted by: Duke64
« on: February 15, 2017, 11:29:02 PM »You may need to set your game to developer 1 if you haven't yet.
Its always the first thing that should be checked from my experience. If this doesn't work let me know. Using gog or steam should be no issue, I also mostly use the gog version.
Here is how if you needed it.
http://www.turokforums.com/t1-moddinguser-content/t1-modding-(get-started)/msg3301/#msg3301