Unless you need that exact build for a specific mod compatibility, the final stable version of 1.4 is .
A working RimWorld folder should contain RimWorldWin64_Data , MonoBleedingEdge , and the executable. 2. Version-Specific Mods 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. Unless you need that exact build for a
Here are the most common things people look for with specific RimWorld versions: 1. Missing Executable or Runtime Files RimWorld.v1.4.3580.zip