Couldn't launch the Arduino IDE in non-portable mode on school computer

Students don't have admin rights to install Arduino on school computer, however the non-admin version exits immediately upon execution. The error was "Settings issues: Arduino cannot run because it could not create a folder to store your settings." I think this is the same issue as #4634, and after creating an empty directory named "portable" the program was able to run. So maybe consider adding this directory by default?

Start by reproducing the non-portable Arduino IDE launch on a school-style account without admin rights, then inspect the settings initialization path. Done means the IDE launches successfully and can create or use its settings directory without requiring administrator access.

Written by the indexing model from the issue text.