Simply run zandronum.exe and select the game you want to launch. The included Zandronum is version 2.1.2 but of course you can use the WAD files from this torrent with any other doom source port you want (like ZDoom).
If you want to play multiplayer, download the full installer for Zandronum and follow the instructions. You already have the WAD (IWAD) files in this torrent so just use them when needed.
You can buy these legendary games for cheap, I included some links in the readme.txt file.