I just found out that the latest version of Mathematica is 10.4. When I login to my portal, it shows that my subscription expired less than one year ago, and I can only download version 10.1 It is a bit disappointing that I am already locked out of version 10.2, 10.3 and 10.4 within less than 1 year. I have two questions:
Is 10.4 a major upgrade?
If the answer is yes, do I have to re-subscribe to have 10.4?