Many repackers, such as those discussed on r/CrackWatch , include a .sfv or .md5 file. Use a tool like QuickSFV to check if your part13 matches the original source. Troubleshooting Steps
If WinRAR or 7-Zip reports a "Checksum error" or "Unexpected end of archive" specifically at part13, that individual file is likely incomplete. CallOfDutyInfiniteWarfare.part13.rar
Are you seeing a when you try to extract the file? Many repackers, such as those discussed on r/CrackWatch