Not sure that the 11.4 update is the problem …
I've just tested one of mine and it's at 11.4 (I don't update the main one used for flight for reasons just like this!!) and it's connected fine to the unsecured network that my PAW has visible.
When connected, Sky Demon and the browser based stuff works as expected … the one used is an Ipad Air 2 of that makes any difference ….