The file part4.rar is one segment of a split archive. You cannot extract it in isolation; all parts (usually Part 1 through Part 4 or more) must be present to successfully reconstruct the game files.
: If you receive a "Checksum Error" or "Unexpected End of Archive," it typically means part4.rar or another segment is corrupted and needs to be re-downloaded. ⚔️ Version 1.1.6.6 Patch Highlights Wolcen.Lords.of.Mayhem.v1.1.6.6.15.part4.rar
: Ensure that part1.rar , part2.rar , part3.rar , and part4.rar are all located in the same folder . The file part4