Do we have to buy every update as a standalone update? I bought "Season 1" & "Season 2 Part 1", but I don't have access to "Season 2 Part 2". I'm willing to support your work and I think you do an amazing job, but I'm not sure if I'm willing to spend 40+ Euros on one season...so my question is: Does the price include the amount of money we already paid or are those individual purchases?