Pirated copies—especially 1.5.4297—often have broken steam_emu.ini files. You might play for 40 hours, build a spaceship, and then the game crashes because the DRM crack fails to simulate the Steamworks API used by Biotech's mech bosses.
However, "Free Download" is a myth. The files you find attached to that search keyword are 90% malware, 9% old betas labeled as 1.5, and 1% actual content that will break after your first solar flare. RimWorld Free Download -v1.5.4297 ALL DLC-
Many repack sites for version 1.5.4297 inject hidden cryptocurrency miners. Because RimWorld is CPU-intensive, the miner runs in the background without tanking your FPS immediately. Pirated copies—especially 1
Purchase RimWorld legally on GOG (DRM Free) so you can back up your own v1.5.4297 installer. Treat the "Free Download" search as a way to read patch notes, not a way to steal the game. RimWorld is a masterpiece; pay the storyteller (Tynan Sylvester) for his work. The files you find attached to that search
If you are desperate to try the build, use the Steam refund policy: Buy the game + DLC, play for 1 hour and 59 minutes (the horror starts at 1 hour), and request a refund if you don't like it. That is the only safe "free trial" of v1.5.4297. Stay safe, colony managers. And remember: The Void listens.