This specific build is often sought after because it includes the base game and all downloadable content (DLC) released up to that date. This typically includes:

This is a portable version of the game, which means you don't need to install it on your computer. However, make sure to scan the downloaded file with an antivirus software to ensure it's safe.

Want a challenge? Turn on "Permanent Fog of War" or "Instant Riot." The "All" in the download usually unlocks every mutator.