You cannot open a single middle part (like part 52) on its own. You need the of files to extract the data.
💡 : If you're missing a part and can't find it, try searching the exact file name on archive sites or the original source where you found the link. If you'd like, I can help you:
Large files (like high-definition videos or software installers) are often too big to send in one piece.
Troubleshoot a specific you're seeing during extraction. Understand the difference between RAR4 and RAR5 formats.