If you are still stuck after Fix #6, the problem is likely a corrupted download or a bad repack. Re-download from a trusted source, verify the files, or try an alternative repacker.
There is nothing more frustrating than downloading a large game repack—often tens of gigabytes—only to be greeted by a cryptic error message the moment you try to install it. One such error that has appeared in various warez and game repack forums is: failed to start clslolz x64exe repack install
Since clslolz x64exe is likely flagged as a crack or hacktool, your antivirus will block it instantly. If you are still stuck after Fix #6,