It says “Download Error” repeatedly

Go into your iPad ‘Settings’ app and find OzRunways in the list. Check that ‘Private Server’ is OFF.
The other thing to check is you’re not on public WiFi (and haven’t logged in yet), and check that you can reach ozrunways.com in Safari.

Also try killing the app from background:
http://timeread.hubpages.com/hub/How-stop-background-apps-on-an-iPh...