You will miss out on v1.22+ updates, which include newer cars and "Modern Classics" content.
Repacks sometimes use custom save paths; ensure you back up your progress manually. pc-repack-dirt-rally-v1-1-black-box
This version compresses the original game files into a much smaller installer while maintaining the full simulation experience. v1.1 (includes early updates and bug fixes) You will miss out on v1