SOLVED: (It was a IPS issue)
When I try to install X-Plane 11b, I get this error:
There was a problem installing X-Plane 11. Please check your internet connection and try again, or contact Laminar Research tech support at [email protected] form help.
(The technical problem was: Couldn't resolve host name)
I use macOS Sierra on my MacBook Pro and my Internet connection is OK.
Thanks
JCCC