Now that the Paizo website's been updated, there are a few seasons and adventures missing from the store front. Given that these are digital products (PDFs), I find that to be an odd decision and potentially either a mistake or work in progress.
It would be easy to think they just discontinued old seasons (a terrible decision, if so, again because it's digital only products and it's really the only modern support we have.... but I'll leave that argument for another discussion). However, the ones that are missing don't really make sense, if that were the case. The ones that are missing are Seasons 0, 1, 2B, 6, 7, and various co-relate... given that 6 and 7 are the newest, the Legacy aspect seems suspect.
Further adding to the confusion is that Seasons 2 and 3 do have SOME adventures present, but not all, and the ones that are missing make no sense in any consideration. Season 2 is missing Adventures 3, 4, 6 (but have 1, 2, and 5??), and Season 3 is missing adventures 1, 2, 3 but has 4, 5, 6.
Some clarity to this would be desired. I know personally, I missed the seasons when they were current due to traumatic life events... Now my daughter is old enough to enjoy PACG and does, thoroughly... we were buying the seasons as we were playing through them, and now that option is gone for most of what we're missing.