Advice from Anet Communications Manager Gaile Gray:
- If you don’t own HoT, you still can “bank” the episode by logging into the game while it’s live and saving it until such time as you acquire HoT.
- If you want to “bank” Episode 3, log into the game before Episode 4 goes live. I’d suggest you do it now so you don’t forget.
- BTW, when I mention banking, I think the vast majority of us are going to play through the content when it goes live. But circumstances can differ, and someone who’s unable to play, or who wants to save the episodes for a more convenient time can do so in the ways outlined above.
https://forum-en.guildwars2.com/forum/game/gw2/Head-of-the-Snake-Feb-7th