Hi!
Since V1.3.1, the installer supports the “UpgradeCode” property of MSI installers. That means it can detect if a previous version is installed and if yes, it will uninstall it automatically and install itself afterwards.
If the installer finds a newer version, it will also detect this and report that a newer version is installed already and will terminate the installation.
I only promoted to manually uninstall the previous version to ensure that the fsx.cfg/fsx-se.cfg entries are then removed for sure, because there was a problem when using the automatic routine. This was fixed in V1.4.0 and forward, so basically just running the SODE installer over an existing SODE installation is working ok now and in the future.