Rimworld.v1.4.3580.zip -

If you own the game on , you can right-click RimWorld > Properties > Betas and select version-1.4.3901 from the dropdown to get a complete, verified copy.

Since v1.4.3580 is an older sub-version of the 1.4 "Biotech" era, most mods labeled for should work. However, if you are looking for a specific "piece" of content: Steam Workshop: You can filter by version 1.4. RimWorld.v1.4.3580.zip

Unless you need that exact build for a specific mod compatibility, the final stable version of 1.4 is . If you own the game on , you