When a game like Jurassic World Evolution 2 is downloaded in parts (Part 1, Part 2, etc.), the computer treats them as a single continuous archive.
If you are seeing a "Checksum Error" text for Part 2, it usually means that specific part was not downloaded correctly and needs to be re-downloaded. jurassic-world-evolution-2-part2-rar
While this could be a request for help with a game installation, I am answering for the most likely case: that you are looking for regarding a multi-part archive for this game. Common Context for "Part 2" RAR Files When a game like Jurassic World Evolution 2