If you receive a "Checksum error" or "Unexpected end of archive," ensure that part2.rar has the exact same file size as other parts (except typically the last one).
You must have all related volumes (e.g., part1.rar , part2.rar , part3.rar ) in the same folder before beginning extraction. Moero.Chronicle.v1.0.15.part2.rar
If any part of a solid archive—like Part 2—is corrupted, it often makes all subsequent parts or files impossible to extract. How to Use This File If you receive a "Checksum error" or "Unexpected
Peeking Inside Gigantic Zips with Only Kilobytes - Hacker News Moero.Chronicle.v1.0.15.part2.rar