: Ensure you have part1 , part2 , part3 , part4 , and part5 in the same folder .
: Check your antivirus "Quarantine" or "History." If you trust the source, restore the file and add the folder to your Exclusions list. University_of_Problems-1.1.0-(Basic)-pc.part5.rar
: One of the parts (like Part 5) downloaded incorrectly. : Ensure you have part1 , part2 ,