I'm aware this was probably a lost cause to begin with but here's what I did...
* Install, default folder, custom install, uncheck all boxes
* Uninstall using Revo
* Program leaves behind 1122 (!) registry entries after uninstall.
Verdict: with that many registry entries not cleaned up at uninstall, it occurred to me that this was not a registry-green program by any standard, so I decided to abandon the effort.