From macOS

Pack the installer to an app with my script.
  1. Put the cloned folder into the downloaded macOS Installer files folder (i.e.: gibMacOS/macOS Downloads/publicrelease/xxx-xxxxx blah blah blah)

  2. Run python3 <drag and drop here>

  3. Choose A.

  4. Choose the version you are installing.

  5. The script should be packing your files to a Installer app. This may take time, be patient!

  6. When it is done, proceed to next part.