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.
Technical Guide: Managing Microsoft Flight Simulator (HOODLUM) Part Archives Microsoft_Flight_Simulator-HOODLUM.part08.rar
If the installer asks for a "Volume 8," ensure the file is not blocked by your antivirus or moved to a different directory. Simulation Requirements If your extraction fails specifically at part08
You cannot extract part08 by itself. You must have every preceding part ( 01 through 07 ) and every succeeding part in the same folder. Microsoft_Flight_Simulator-HOODLUM.part08.rar