You don't license unlocks speed which is great for file transfer mainly. If you are happy with how it is with your current free version - then no need.
The connecting side ONLY (the one who initiated the connection) must have a license to unlock the speed. So in other words - only one side can have a license (the one who connects) to unlock the speed limit.
How do I recover my lost registration key?
Callsign Change, whom do I contact for the License continuation?
can i have a key
You don't license unlocks speed which is great for file transfer mainly. If you are happy with how it is with your current free version - then no need.