Before starting the activation process make sure you know your License Sever settings (name or IP and port) and Extension Floating License name.
At the beginning you have to start MDT Extensions License Manager tool.
Click Add New License.
Select SW5 Support Plug-in from the extensions list.
Select Floating License option.
Provide license server settings with alias name sw5_support.
Press Test Connection button to assure proper connection to license server.
Press Next button. MDT contacts license server to obtain a license.
Deactivating Extension Floating License
Borrowing Extension Floating License