Prior to download a new version of the installer, it is important to check all upgrade notes that may affect you (any since the version you are currently on). If you are upgrading from one version of the same LTS to another, check
When you first run a new version of the installer, your config may be upgraded. Once this is complete, go through all sections within the installer, re-confirm all options (making sure to save any changes / click save on any pages that do not have it greyed out), enable Dry Run in Group Sync (if configured) then hit Deploy.