Krutsch
Headphoneus Supremus
Basically you deactivate one and use it on another computer. I don't know how the license is being used elsewhere if there isn't an Internet connection.
Nope. I haven't "deactivated" either one, ever. And, I switch between the two copies, routinely, without any problems. But, again, I only use one at a time, but one of them is left running all of the time. Either Roon isn't checking or they only check during playback. I could test this...