So, as detailed in a long thread, I’ve had lots of install problems with this version. I’ve wiped hard drives, etc. I’ve been not using my 2011 Macbook Air since I got it settled (trying an ipad pro as replacement), but have gone back to it. Tried to register my version, and it’s rejected. I have copied and pasted my information from my email, and it still says to check my information. Suggestions? Have I hit some kind of limit of registrations?