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I upgraded to version 10 on the 30th of July and today received the email from parallels with my free version 11 product key.
I update every 2 years. But only own 1 mac. so I can't help you there.
Today I got an email from parallels telling me that I qualify for a free upgrade to version 11 since I purchased version 10 on the 30th of july....
they have a 30 day refund policy. Ask for a refund, then use the money to buy version 11.
I too was offered an update to parallels 10 through a email offer with a promise to get the next version (11) for free. I took the offer on july...