When you see the tag "ALL DLC" attached to version 1.5.4297, it refers to four massive content packs. If you are looking for a "free download" that includes these, you are looking for roughly $90 worth of premium content compiled into one package. Here is what each adds:
Version 1.5 was released alongside the Anomaly DLC, but the patch itself is free for all base game owners. Here is what the update brings: RimWorld Free Download -v1.5.4297 ALL DLC-
“It’s a trap,” Tynan muttered, wiping blood from a shrapnel cut. “That patch note was flagged ‘Anomaly’ before the crash.” When you see the tag "ALL DLC" attached to version 1