You cannot extract part08 by itself. You must have every preceding part ( 01 through 07 ) and every succeeding part in the same folder.

Technical Guide: Managing Microsoft Flight Simulator (HOODLUM) Part Archives

To begin the extraction, always right-click on Part 01 and select "Extract Here." WinRAR or 7-Zip will then automatically pull data from part08 when it reaches that percentage of the progress bar. Troubleshooting Common Errors

Typically 10+ parts depending on the specific compression ratio. Format: RAR5 (Split Volume) How to Handle Part 08

If your extraction fails specifically at part08.rar , that specific file is likely corrupted. You should re-download only that segment rather than the entire library.