A working RimWorld folder should contain RimWorldWin64_Data , MonoBleedingEdge , and the executable. 2. Version-Specific Mods
If you are playing offline, many modders keep "Legacy" branches of their mods specifically for 1.4. 3. Updating to the Latest 1.4 (or 1.5) RimWorld.v1.4.3580.zip
Here are the most common things people look for with specific RimWorld versions: 1. Missing Executable or Runtime Files Since v1
If the .zip file is missing a "piece" to make it run (like a .dll or the RimWorldWin64.exe ), it’s usually because an antivirus program flagged and quarantined it. RimWorld.v1.4.3580.zip
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.
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.