If you get an error specifically for Part 09 during extraction, it means that specific file is corrupted. You must delete part09.rar and re-download it.

It looks like you’re trying to assemble or share a multi-part archive for the GOG version of . Since you specifically mentioned part09.rar , Medieval Dynasty (vX.X.X.X) – GOG DRM-Free

If the extraction stops and asks for Part 09, ensure the file is named exactly Medieval Dynasty GOG.part09.rar and is in the same directory as the others.