: Ensure the filenames are identical except for the numeric extension. If one is named PEY(1).7z.001 and the other is PEY.7z.002 , the extraction will fail.

: If one part is smaller than the others (except the very last one), the download might be corrupted.

: Ensure you have PEY.7z.001 , PEY.7z.002 , and PEY.7z.003 in the same directory.