Hi Peter,
If you have done the upgrade to any post 20190810 software version, your OGN will check periodically (several times a day) for updates and if it finds one it automatically downloads then installs them.
The most likely reason you would need to re-run the ./PilotAware-OGN.config.sh script after that is if you add an SDR to a single SDR setup, or replace either of the SDRs, as the config script writes a Specific Address to each of the 2 x SDRs to ensure that the unit automatically uses the correct SDR and attached antenna for 868.3MHz (OGN) and 1090MHz every time it reboots. To do this, you must make sure your intended OGN antenna and dongle are in the Top Left USB slot (with the Ethernet Port to the left) and the one for 1090 is in the Bottom Left Port, then accept the naming suggested by the config.
The other reason might be to change the e-mail contact if the person maintaining the station changes.
Any probs come back on here.
Best Regards
Peter R