Bring your films, shows, indexers and settings from the apps you use now; nothing is deleted there.
In Broadcast: Server, Setup and health, Move from other apps.
In Classic or Neu: Settings, System, Move from other apps.
Usherr reads what your current apps know and brings it over. Your old apps keep running and nothing in them is changed.
For each app: its address and its API key (in that app, Settings, General). Then pick what to bring: the library, indexers, download clients, quality profiles.
Run it again to pick up anything added in the old apps since. When you’re happy, you can switch them off.