Ios 9.3.3 beta profile cannot donwload due to unknown error
I can't installed due to unknown error
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Ios 9.3.3 beta profile cannot donwload due to unknown error
see also the other topics:
https://forums.developer.apple.com/thread/50807
you can set your system date on somewhat before july first and it will work.
thanks to Adamthegreat for the hint