The 1.4 update (the "Biotech" era) was one of the most transformative in the game's history. It introduced:
This specific sub-version was a "hotfix" build. It didn't add new content but was essential for: Rimworld.v1.4.3531.rar
Correcting errors where certain scripts from the RimWorld Workshop would crash the game. Rimworld.v1.4.3531.rar
Resolving issues related to mechanoid recharging and child-rearing mechanics introduced in the expansion. Rimworld.v1.4.3531.rar