Carl is exactly right—you don’t need the old PC to be functional to fix this. Since the license is managed in the cloud, you can “force” the transfer from your new Nucleus.
To fix this:
Open the Roon app and connect to your Nucleus One.
When prompted to sign in, you will likely see a message saying your license is already in use by the PC.
Simply click the Unauthorize button next to the PC’s name on that screen.
This will instantly release the license and allow your Nucleus One to take over.
Did you manage to log in to the Nucleus, or are you running into an error message before reaching that screen?
We’re going to let this thread auto-close under the assumption that the issue was resolved. Our diagnostic servers show the desktop RoonServer instance hasn’t been active since shortly after you posted.
Please reach out here if we can assist further or if you have additional questions. We’ll reactivate this thread as necessary. Thank you!