We are sincerely sorry for this issue. For all people who do not register successfully, please contact firstname.lastname@example.org. We will send the license code to you individually. We are sincerely sorry for this issue.
Quite often if you try to copy and paste the details into the registration it will not read them properly and tell you the details are wrong so l actually went back and typed the details in instead of pasting and it worked for me, so try it.
I downloaded and installed WordMate a couple of days. Everything seems to install just fine, but when I opened Word 2016, there was no WordMate tab. I just went through the whole process again. I got a couple of messages saying the installation had been successful, but again their is no WordMate tab. I have an Add-Ins tab, and when I click on it it shows me two add-ins, but WordMate is not one of them.