Please note, Mari 4.x is not currently available for Mac (find out more here). In the meantime you can purchase and continue to enjoy the previous versions. We will let you know when Mari 4.x for Mac can be downloaded as soon as it is available.
FloatingCan also be used (one at a time) by other machines actively networked to it.
Node-lockedCan be used only on the machine whose System ID the license is keyed to.