Verify you have SPECIAL1232_PACK1.part1.rar , part2.rar , and any subsequent parts.
Select or "Extract Here" from the context menu. SPECIAL1232_PACK1.part2.rar
Ensure every segment of the archive is downloaded and placed in the same folder. The software needs to jump from one part to the next automatically to complete the reconstruction. Verify you have SPECIAL1232_PACK1