I purchased the upgrade to Parallels 11 since I had previously been using Parallels 7. During installation of Parallels 11, my new activation key is recognized with a green checkmark, but nothing happens when I enter my Parallels 7 key. There is no checkmark and the Activate button remains grey. My only options are to buy or to try the 14 day trial. I have uninstalled Parallels 7 and restarted my computer. Please advise.
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