File: Rimworld.v1.4.3613.incl.all.dlc.zip ... Official

: Since this is version 1.4, you must use mods specifically tagged for 1.4. You can find these on the RimWorld Steam Workshop by filtering for that version, or on Nexus Mods . Developing New Features (Modding)

: Extract the .zip contents to a folder. This version is often used for stability in long-running modded playthroughs before the jump to version 1.5. File: RimWorld.v1.4.3613.Incl.ALL.DLC.zip ...

If you are trying to "develop" or add features to this specific build: : Since this is version 1