I Have Multiple Mac Computers. Do I Need a Separate Subscription for Each?
You can unlock 2 personal macOS devices with one license but work on one at a time in licensed mode.
Start you subscription on one device first.
Afterwards you may unlock the second device with your credentials (e-mail and password) via "Manage Existing Subscription".
In order to use the software on another, third Mac, you need an additional license or must first deactivate a previous device.
Note: Merlin Project on iPad or iPhone requires a separate, additional subscription.