Right-click on (only) using a program like WinRAR or 7-Zip . Select "Extract Here" or "Extract to [Folder Name]" .
Ensure you have every single numerical part in the same folder (e.g., part01.rar through the final part). If even one part is missing or has a slightly different name, the extraction will fail. Extract the Files Hitman.REPACK.CPY.part08.rar
Open the resulting folder and look for a setup.exe or install.exe . Right-click on (only) using a program like WinRAR or 7-Zip