All Here,

DAZ Tech Support got me onto "Basic," so now there will be no rentware payments in the year 0000. Phew. Still no Cancel button, but it no longer matters. I learned they had blocked my card, for undisclosed reasons, so a different card solved that. Now, I have the opportunity to find out exactly what in the devil they're up to, before I decide what it's worth.

All's well that ends well.