Working on multiple devices
Your cloud license can be used on different devices, but only one device at a time. When you are finished working on one device, release the license: This will free up your license for the other device.
If open Archicad on a second device while the license is still in use on the first device, the "License in use" dialog appears. Click Release License.

This takes you to your Graphisoft account site. Use the Licenses page to release the license from the first device.