You need all parts (Part 1, Part 2, etc.) in the same folder to extract.
If you are missing Part 6, you must download it from the exact same source as the other parts to ensure the checksums match. FrSi_TCRSR.part6.rar
Use WinRAR or 7-Zip to open Part 1, which will automatically pull data from Part 6. Common Issues You need all parts (Part 1, Part 2, etc
These archives often require a password provided by the original uploader (check the site where you found the links). You need all parts (Part 1
If extraction fails at Part 6, that specific file is likely corrupted and needs to be re-downloaded.