Sorry for the delayed reply
1. Yes, TS 10.x and 11.x is supported
2. Yes. You are "supported" as long as you do not exceed the licenced capacity at any time, so if you do not have the servers active (= in use) at the same time, you are ok.
3. Noted. We know about this issue and will investigate to improve it.
Thank you !
Is it possible to use those licenses also on this new server during the time we have the old and new infrastructure.