You do not need to extract every part individually.

Ensure Part 10 is the same size as Parts 1 through 9. If it's much smaller (and it's not the very last part), the download didn't finish. ⚠️ A Note on Safety

Once you have all the files (Part 1 through the final part) in the same folder:

Usually, all parts are listed in a numbered table at the bottom of the post.

Which version (1, 2, 3, etc.) are you trying to install so I can give you more specific help?

Dealing with multi-part RAR files can be tricky because if one piece is missing or corrupted, the whole installation fails. 1. Finding the Specific Part