His osx is 10.11, the latest release and we have already tried with Gatekeeper. No problem, we'll search for another tester to try the app Thanks SimonS
We found a new tester with 10.9 and it works perfectly! At this point it is really an issue of the new OSX El Capitan 10.11. I read on the internet they have restricted permissions and some apps are no longer compatible or usable.
