: You will need a utility like WinRAR or 7-Zip to rebuild the files.
: If you receive a "Checksum Error" or "CRC failed" during extraction, it usually means this specific part (part 4) was corrupted during download and needs to be re-downloaded. sc24942-R2WP.part4.rar
: Indicates that this is the fourth segment of a split RAR archive. : You will need a utility like WinRAR