I can't install apps ready for test like this one:
http://apps.formeego.com/staging/app...on/fahrplan2/#

If I try I alway getting a .ymp file. After selecting this from the List of downloaded files I'm gett ing an installation dialog but after a while there comes up the messsage "installation not possible".

How I can test apps? There seem to be users which where able to install the apps ready for community qa.