Game over for the pain , windows 7 has been updated, downloaded Unreal engine 4.7.4 & it’s work like a charm .
Thank you all for your patiance and your helps.
Indeed 4.7.4 fixed some annoying little bugs.
Just for record mine problems with iphone was caused by either itunes or unreal keeping copy of outdated keypairs and using that instead of new ones.
Was quite a hunt do remove all those pgp keys from all possible places, but it worked.
I also had problem with android once because i name of my project did not followed rules of android naming. No error messages, just crashing, but it was easy to find and fix.