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The link given downloads the official 11.1.3-32521 version and not a hotfix. As i reported before the 11.1.3-32521 version dos not fix the problem.
Parallels Desktop Version 11.1.3 (32521) does not fix the problem
Thanks for the reply. Just for the record, i have also installed OSX 10.11.4 Beta on hardware and it works there.
I have exactly the same problem i.e. after upgrade to OSX 10.11.4 Beta the keyboard and mouse no longer work. How are you supposed to update...