Problem registering after reinstallation

Due to a serious issue in my Windows 10 PC, I had to uninstall CorelDRAW 2017. As I had everything necessary to reinstall it I did so and all went well, except when authenticating, for a message in red indicated a server error, thus I couldn't complete the registration. My internet connection was OK, so I could log in to my account on the Corel website and ask for their help.

Their answer: "Unfortunately, your product version is no longer supported. As the computing environment changes so quickly, it is very difficult for us to maintain older versions of the software because they occasionally have problems when installed on new operating systems."

Well, I wonder why it worked for years on Win10 and in a matter of only two days it's not compatible anymore. Besides, the message was about a server error and the package is installed, so it seems not to be a compatibility issue, but a Corel registration problem. I understand they're saying they ended the support for my version on Win10. But I remember I read somewhere the package was for me "to keep forever", and now this...

Package installed

I can try to revert my system to a time prior to all that using System Restore. But before that I ask you to please help me find a solution, if any. TIA.