Switching to Single-User Licensing - Arnold User Guide
See this playlist to learn how to use the Arnold License Manager.
Suppose you're currently using one of your company's Arnold licenses, and those licenses are on a license server. But now you've got a single-user license and you want to switch to single-user, so the network licenses are left your render farm.
Open the Arnold License Manager.
Click License > Switch to Single-User Licensing.
Sign in with your Autodesk ID.