So to install this mod you simply need to download the oldest version first, read the instructions on the first version (it tells you 3 other things you need), then you download the 5.00 version, then 5.10, and finally 5.20 (the current version) and you're done.
That's right, just extract them all into the Quake 2 file location (If it needs to replace anything let it) and then run the TFQ2 application. This should work, do let me know how that goes.
how are you able to play the game, mine says that base1.bsp can't be loaded. I downloaded the 5.0 then the 5.10, then the one you have. where did you get your base maps from?