Well, there's an improvement in registering groups and the discounts based on selection of ticket type, but the system now has a similar problem with individual registrations (ignoring the 100% discount, trying to charge for an event).
So what should we others that have the same problem? No group registrations going through in DT Register 3.2.8 because of the Next Step button not working on the confirmation page, so far lost hundreds of euros because of DT Register again not working. And three weeks after posting about the impossibility of installing DT Register 3.3.x (site crashes), still no answer about what the issue is with that either.