I have a mid-2009 MacBook Pro that is in like-new condition, but the OS is dated (maxed out at El Capitan), so I cannot install the latest browsers (and the security that comes with an up-to-date browser). Parallels Desktop seems like the perfect workaround for this problem, so I went to the archive and downloaded Parallels 14 (which is, if I understand correctly, the latest version that still supports El Capitan). Installation went smoothly, but when it comes time to register the software, the dialogue box is just a blank. So here's my first question: I need to upgrade my RAM, and I see OWC offers a discount coupon on Parallels Pro. Would the product activation key from that purchase work to activate the download of Parallels 14 I already have, or would the dialogue box issue prevent that? Second question: If I can get version 14 working, will I have to pay a subscription fee year after year, and if so, will it be the same fee as for the current version?