I have been using Draftsight for private purposes for years. Renewal of registration has worked fairly well so far, but now a renewal is required again. It just doesn't work. I even updated the sw totally, it's now 2017 SP3. I have received the registration email fine, but the link ends up to an error page everytime. I have tried with several email addresses even. The result is the same everytime. What can be wrong? The error page looks like this: