Ok yeah I guess I'm not talking about upgrading SSRS I'm talking about moving the SSRS databases, reports, subscriptions, etc.... to a new server which is a higher version. So migration to a higher version is what I mean. SSRS has already been installed on the new server.
Source is SQL 2017 running SSRS build 14.0.600.1109
Destination is SQL 2019 CU16 instance with SSRS build 15.0.1102.911
Both servers are running SQL and SSRS.
I'm just trying to find the procedure to do the migration. I see there is a migration tool from MS but it's a decade old.