: You can download the official tool for free from the 7-Zip website .
: If you are missing any numbered part in the sequence, the extraction will fail and the final file cannot be "made" or repaired. SS-LisSS-012_s.7z.001
Do you have of the file in one folder? How to extract part files 001 using 7zip on windows (2026) : You can download the official tool for