A new version of the iOS app has just been released. The main difference is that the new version supports streaming. So, you no longer have to download each lesson before you can start playing it.
You can still manage downloading the audio if you need to - for example if you know that you’ll be somewhere without internet access - just go to the “Levels” tab and do a long press on a lesson number - it will give you a little menu with an option to download (or it’s already downloaded, it’ll give you the option to delete the downloaded file to save space).
There’s also a new option (see the Settings tab) to auto-advance to the next lesson (it’s turned off by default).
Ah … and I almost forgot - the advanced content works in this version! Look for it on the Levels tab by swiping past Level 3.
It’s been in beta test for a while, but I still expect some fresh hiccups to show up - so don’t hesitate to give a shout here if you have any problems with the updated app!