I’ll break this mini-rant down into the three sections above and link them in below. All three are intertwined in this scenario.
DeNoise effectiveness going up/down on version changes. See here
installing a new (trial) version overwrites the non-trial version (without asking). See here
software upgrade renewals on some, but not all pkgs no longer feasible. See here
Conclusions: Topaz Labs software upgrade paths no longer make any sense in my case. EOL.