You cannot "open" part 4 individually. You must initiate the extraction from Part 1 .
When downloading game archives like this, always ensure you are using a reputable source and scan the final extracted folder with updated antivirus software to protect your system from malware. ER_2GB.part04.rar
If a 60GB download fails at 90%, you lose everything. If a 2GB part fails, you only need to re-download that specific segment. You cannot "open" part 4 individually
Ensure ER_2GB.part01.rar through the final part are all in the same directory. If any part is missing, the extraction will fail with a "Volume Corrupt" or "Missing Volume" error. If a 60GB download fails at 90%, you lose everything
If Part 04 specifically shows a "Checksum Error," it means that specific file was corrupted during download and needs to be re-downloaded. Why Is It Split into 2GB Segments?