Opening up AppList today sees:
In-app updating is working well in AppList - so everyone's always got the very latest app store on their device.
The 'Unable' dialog is fine - it just wants confirmation that you want to install the same app that's running. Tap on 'OK' and you're good to go. (right) The current app front screen, note that Podcatcher (belatedly) made it, in addition to some other favourites featured recently on AAS.
Curiously, the new category, 'Education', appears to be empty for me - maybe it's populated with another language selected in Settings?
Hopefully AppList is working out for you all. See here just in case you haven't already got this installed or if this is new to you. Also, if you have custom firmware installed, make sure you tick the option in settings to show 'unsigned' applications, you'll see extra applications!