Go back to where you downloaded it. Multi-part archives require you to have every part in the same folder before you right-click the first one and select "Extract."
The official tool for .rar files, available at rarlab.com . 2. Is a "Piece" Missing? ssv1.rar
If the archive is corrupted or says a "volume" is missing (e.g., it's asking for ssv1.part2.rar ), it means the file was split into multiple parts. Go back to where you downloaded it