By the way, clicking through all the Download links, I never saw any other available versions other than the pay version, so don't believe the hype about 'license freedoms' and 5 different update plans all for the same one-time low, low price of 10 Euros. Programmers never make good marketers.
The price is more than fair considering how much use I'll get out of this gem, and the support is friendly and responsive.
Turning off the module returned my web site to normal.
What I found was that even the process of buying DTRegister is easy. No convoluted series of links and back buttons to get all the various pieces and parts. Then, once installed, I found it to be much, much more than just the sensible, working component I'd been searching and hoping for. It's intuitive, infinitely flexible, and smart. In the end, the cost of DTRegister was worth every cent for my time and sanity.
Thank you, DTHDevelopment, for making this flawless, multiple option payment platform.