Why?

The Alpha had slightly different requirements than the final 78 GB retail game : 64-bit Windows 7/8.1/10.

The iconic "gore nest" hum? The Alpha version sounds like a dentist's drill mixed with static. Weapon sounds were stock audio library files. Mick Gordon’s final, snarling synthesized soundtrack? Absent. Instead, the Alpha used generic metal riffs from a royalty-free library. It’s fascinating to hear what could have been.

In the context of PC gaming, refers to a group or platform known for providing "repacked" versions of games. These releases typically include the game files modified to run without the need for the Steam client or official DRM.