Difference PUN2 Free and PUN2+ ?

1 Could you enumerate the difference between PUN2 Free and PUN2+ please ?

"Photon Unity Networking 2 - PLUS Version - includes 100 concurrent user Photon Cloud plan for 60 months"
What does that mean ? and "concurrent" ?

2. If i start my game on PUN2 Free, can i change later for PUN2 + ? the change doesnt will destroy my code ? or its easy to migrate or for very advanced ?

Thank you.

Comments