This requires just a little bit of command line knowledge, but overall it’s pretty straight-forward

  1. Open
  2. Change your path to the directory where the zip file exists
  3. type zip -d __MACOSX/\* and hit enter (assuming your file is named

The __MACOSX folder should now be removed from the zip archive.

Note: if the path or filename contains spaces, be sure to escape the space with a ‘\’. Example: archive\