I got the Aps to work now. As mentioned by Till, there's also an Aps Installer in ISPConfig. That Aps installer isn't working or the Repository is totally empty. What's about: if I create my own Repository on Server, how I could point the Aps Installer to that and what are the requirements the Install Script must meet? While installing an own Aps, I had to manage to change the Permissions for 2 folder to include Write access for to get the Aps working correctly. That were not a big deal for me but what's about novice user's who didn't have the knowledge for to do that? Could such step be automated in the Aps Installer? There very little infos available about that ISPConfig Aps Installer! Thanks for more infos and advice.