RimWorld has one of the most active modding communities in gaming. When a major update (like v1.5) drops, it often breaks older mods. Players download specific archives to keep a "frozen" version of the game where their 300+ mod collection still works perfectly.
Users typically look for specific version archives for two reasons: RimWorld.v1.4.3549.rar
Shelves that actually hold multiple items (a huge quality-of-life win). RimWorld has one of the most active modding