Hi,
1- Shut Down the engine (ONMODE -kY).
Just run ./installserver
and enter the new Licence and Key when prompted.
The ./installserver will "Re-Brand " all files.
By thw way, you don't need to uninstall.
The installserver program doesn't destroy any DATA FILEs (RAW or COOKED) or other config files.
2- Bring the engine UP (ONINIT -V)
Best Regards,
Francisco Virgilio.