Deactivating floating license may be useful in case you plan to use MDT for a long time without connection to license server. After deactivation you must activate Dedicated License to unblock MDT extension.
MDT Professional Edition enables to borrow floating license which also allows to use MDT without connection to license server. When borrowing license deactivation is not necessary but MDT extension is unblocked for a limited period of time and license is not available to other users. Borrowing license is described in Borrowing Floating License task.
At the beginning you have to start MDT Extensions License Manager tool.
Select License Server tab.
Uncheck Use License Server checkbox. After deactivation the license server settings are preserved.
Select License Details tab. Deactivated license is no longer visible in licenses table.
Activating Extension Floating License
Borrowing Extension Floating License