Just for the record: I had a problem in another host, where the previously installed free YT Origami HOF (impulse reverb) blocked the loading of the full Origami version (included in the fire sale). Therefore I suspected a similar problem here.
The trick with the track template (or FX chain template) works fine. Once the template is inserted into the stereo project, IndeFX is included into the plug-in list and is accessible like any other plug-in via the “normal route”. So the FX can then also be inserted into the master channel (which does not load templates).
I’m no expert but my understanding is that the activation (challenge response) probably relies on a combination of the registry, the dll and a date-stamped file deposited somewhere on your system.
As long as you don’t delete the dlls you shouldn’t have to re-activate.