Due to popular demand here the .zip file version of Ultra64 0.2
Ultra64 Release v. 0.2
Extract the downloaded Ultra64 v02.zip into your Turok 2 main directory, for example "E:\Program Files (x86)\GOG Galaxy\Games\Turok 2\"
After that you should have a "mods" folder inside your Turok 2 directory, wherein the mods data lies, in form of a file called "ultra64.kpf" and a folder called "ultra64 readme".
After that you just have to start up the game and enjoy!
For more information you will find the readme inside the "/mods/Ultra64 readme" folder.