Use the reconfigure ACC command to change settings, such as ports.
Make sure that no file in the installation directory is locked. Therefore, close all Command Prompts pointing into the ARIS installation folder.
Make sure to exit ACC before running the update setup.
If the ARIS help link does not work anymore (404 error) after the update of a custom configuration, the help URL is broken. You can easily fix it by modifying the useraction_default.xml file (<ARIS installation directory>\server\bin\work\work_copernicus_<s, m or l>\base\webapps\ROOT\WEB-INF\config\<customization>\instances\UserAction\).
In the broken URL the /connect/ entry is missing, for example: