Has the EULA for Corel software changed?

I have just purchased CDTS 2017 (education) and installed it on my office computer.  As with previous versions I understood from the EULA that the software could be installed on up to 3 machines (e.g. office, home, laptop) as long as the it wasn't being used on more than one machine at a time.  However I just tried to install in on my home PC and received the message that I have exceeded the number of installs - but I have only installed it on one prior to this attempt!  Is Corel seriously asking us to buy a separate licence for both my office and home PCs?
cheers
Bill