I already have access to the Sharepoint Store and I am able to download apps. However, I see most of them grayed out and, once downloaded, I cannot install them. I get the error message:
Sorry, this app is not supported on your server
I get this issue with yammer, but also with any other app.
Anyone knows what I am supposed to do in order to make this working?
Edit: I am not able to find the app package (.app file) where is this file located in my server?