Okay, so the question now is whether this AP stuff is actually available now. I just went and bought the "2015 pack" which supposedly includes the RotRL encounters (unless I read it wrong), but I don't see the encounters in the updates. There's what appears to be a "teaser" update, which I downloaded and which has I think one monster (some kind of goblin swarm, or something, as I recall) but nothing else I can find. I would have thought this would have ended up as an item in the "Encounter Library", where I already have an entry for "we be goblins" or "we be goblins too" one or the other. But there's nothing there.
So the 2015 Pack does not include the AP Encounter Library's. Its a separate package to buy for 25 bucks. Once you do a new "download" will show up where you can download the RotRL Encounter Library.
I don't work for LW so feel free to send them emails about such questions actually. Posting here on a blog post of Paizo will most likely mean your question is not seen by LW.