Ensure your download comes from an official source like Steam , GOG , or the Ludeon Studios website to avoid malware and support the developers.
This specific build (3580) included minor bug fixes to ensure the game remained stable while running heavy mod lists or the Biotech , Ideology , and Royalty expansions. Installation Notes If you are using a standalone ZIP version of the game: RimWorld.v1.4.3580.zip
Extract the contents of the ZIP file to a dedicated folder (e.g., C:\Games\RimWorld ). Ensure your download comes from an official source
Significant reductions in "tps" (ticks per second) lag, especially for late-game colonies with many pawns and animals. RimWorld.v1.4.3580.zip