> I have had the complete sample set for the Bovenkerk Hinsz for several months and have struggled to learn what everything is or means since it is in a non-English language.
There shouldn't really be much there in a "non-English language" except the Dutch Names of all the Stops and the Divisions, and that the Couplers are called "Kopeling".
> I have unsuccessfully searched for any kind of information about its installation and use, so I have gotten rather frustrated.
Installing the set should be straight-forward.
You can read about the Organ on the milandigitalaudio.com website, and if you need to translate any of the stop names, you can check the Organ Stop Encyclopedia online.
> Surely, there must be something somewhere that I am overlooking regarding this wonderful sample set.
When active in your Hauptwerk system, there is a menu item under the "Organ" Tab for "Organ Information". Click on this to see either a PDF about the Instrument, or some relevant Web-pages (off-line).
> I also think that I must not have something installed properly since I can't get some of the stops to sound.
Configuring the set for your system, remember that this is a four-manual Organ, so all of those four manuals have to be assigned to somewhere that you can play them (fixed manuals or floating divisions on your own system).
> I would really appreciate any information that users of this set are willing to share with me.
Work on some of these ideas, then perhaps you can formulate some more specific questions that others can reply to.