While this is discussed in the AlliGator Installation manual page, as a reminder, the latest version installer can be found in the following Github repository folder:
All other previous versions' installers can be found in the folder:
To install an older version than the currently installed one, first uninstall the current version of AlliGator. Settings will be preserved in the process.
There is no need to uninstall the current AlliGator version when upgrading to a newer one.