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Please see the official X‑Plane Support page for help.
Just like you I am waiting on the official release of X-Plane 11. No doubt there will still be modifications which will be released as 11.1, 11.2 etc.
The following provides an answer from Marty who works within Laminar Research. The link is at http://questions.x-plane.com/8385/end-of-xplane-11-beta-when
By the way, if you are one of those flight simmers wanting the Steam version, which is a modified version of the original X-Plane package by a third party, then all problems and possible release dates have to be addressed to that 3rd party. Laminar Research will diplomatically advise accordingly as they have done to others in this forum. The analogy is you buy a Ford and ask Toyota to carry out warranty work. They will decline.
Hope this helps.
You can buy X-Plane 11 Digital Download here (it is still beta). Because of the probability of encountering bugs in the beta, all purchases at this time also include access to the X-Plane 10 digital download.
There is a release date set to 30 Mar, 2017 on Steam.
This site is no longer being actively maintained.