Hi and thanks for your question.
There are several ways to load a layout. The problem is that, if you use an Ad-Hoc network, it limits them.
One way to go is to download the layouts (.mididesigner) files on your computer, and move them to the App (MIDI Designer Lite) via iTunes.

That way you'll be able to access the files via Config -> Actions -> Load. This will work even without an Internet connection.
Otherwise you'll need to tap and HOLD (long-press) on the file of interest where you find it on the Web.
Comment back on this answer and I can help you out more.
Thanks!