The software will automatically pull data from part2.rar and any subsequent parts to rebuild the original file(s). :
7-Zip is a popular, free, open-source alternative that handles multi-part archives.
: This usually means one of the parts is corrupted. You may need to redownload the specific part that triggered the error.
Do you have of this pack in one folder, or is a specific piece missing? How to merge .part files using WinRar
: Ensure you have every volume of the pack. If any part is missing, the extraction will fail because the data is spread across these separate files.