To upgrade the server, download the installer for the desired server version and install it in the same directory path as the old server. Do not uninstall the old server before launching the installer. The latest Hansoft server can be downloaded here.
Run the installer and install to the same location you have the old server installed. Check the server log for problems after the installation has finished (see Logs and Email Notifications).
The OS X installer does not require you to manually stop the service when upgrading. Restarting the service is also handled automatically.
Follow the instructions provided by the dialog box to complete the server upgrade.