Ensure you aren't missing Part 7 or Part 9. The archive will fail if even one small piece is absent.
You cannot open Part 8 by itself. It contains only a fraction of the total data. Hagme1617v1.10.part8.rar
To extract the contents, you must have every single part (Part 1 through the final part) in the same folder. Ensure you aren't missing Part 7 or Part 9