To understand why this mod is so sought after, you need to appreciate the original Kratos DLC from the PS3 version. Unlike generic skin swaps, Kratos in MK9 had:

Many users find that emulating the PS3 version via RPCS3 is a more stable way to play as Kratos on PC than using a native mod, which often lacks a direct, easy-to-find download link. Mortal Kombat Komplete Edition Reviews - Metacritic