The server tool must run on a PC all the time you need the streaming service to work ... You will find all client apps for supported OS in the download section.
There is no limit in time for the license ... And you will get all future updates.
I have create a new account for enigma-tv, I want to stream TV channels on my Intel NUC. what else do i need to start watching TV. Do i need more equipment like dreambox etc. Kodi run very well on my machine. I understand that i need to purchase i license, but i wanted to know if i need some extra equipment.