Right-click specifically on the file ending in .001 .
Are you missing any of the for this specific archive? Swift_Chubby_Engine.7z.001
Download and install the free 7-Zip software (or Keka if you are on a Mac). Right-click specifically on the file ending in
If you get an error saying the file cannot be opened as an archive, you are likely missing one of the numbered parts. Swift_Chubby_Engine.7z.001