Highly compressed versions (often found on community-repack sites) can reduce the initial download to roughly 15 GB to 25 GB .
Remember: Once you install the 14GB compressed version and confirm it works, consider buying the game legally to support NetherRealm. But until they release a proper "compact" version on Steam, the repack community offers the only solution for low-spec gamers. injustice 2 download for pc highly compressed better