: If you get a "Next volume is required" error, you are missing one of the parts in the sequence.
The file is the ninth part of a multi-volume RAR archive. Because it is a split archive, you cannot "open" it individually to see its full content; it must be combined with all other parts (part01, part02, etc.) to extract the data. How to Access the Content
Do you have (01 through 08) in the same folder?