Hi John
Sounds like you have not done the setup after your upgrade. If you log into the PAW wifi with your browser and check the Home page it will likely show your licence has expired. In which case you will need to go to the configure screen and enter all of your details again, including your licence key. the same one you had for your classic should work provided it's still within date and you have not changed your Raspberry pi. If you have changed the Raspberry Pi you will need to inform PilotAware of the new Mac address and get the licence transferred.
I should add that this is assuming you used the "upgrade" package and did not purchase a brand new Rosetta.
Alan