Keep them both! In fact, you will need both during the transition period while you convert your files from 9 to 10. The transition period should not exceed six (6) months. Deployment of the software after that period shall not exceed the licensed quantity of concurrent users of ExtendSim 10.
Yes, the Floating License is hosted and managed on your premises.
If you do a manual activation, no connection to the internet is requested for either the Server or ExtendSim on Client devices.
Even if you do an automatic activation, it is only a one-time web-based exchange of Server and license information to activate the Server’s license.
Subsequent to installation and activation, the Client only connects to the License Manager on your Server, and the Server internally validates the License File and receives license requests from Client devices.