: These "parity" files are used to repair or reconstruct missing segments (like your part4.rar ) if they are damaged or deleted.
: This specific file name follows the naming conventions of unauthorized movie distributions. I cannot provide direct download links for copyrighted content or specific files from pirate sites.
If you are trying to fix a "missing volume" error while extracting:
: To extract the full video, you must have all numbered parts (part1, part2, part3, etc.) in the same folder. If you are missing part 4, you generally need to re-download that specific file from the original source where you found the others.