If you are focused on part 09 because of an error, here are the likely culprits:
Repacks are highly compressed. Ensure you have enough room for both the RAR files and the unpacked installer, which can often double the required disk space during the process. A Note on Safety Sword and Fairy 7 - [DODI Repack].part09.rar
If WinRAR says part 09 is "corrupt," your download was likely interrupted. You will need to redownload just that specific part. If you are focused on part 09 because