There are a two or three subsets to the problem. One of them is probably just a bandwidth issue on my part.
One of your earlier responses to this problem suggested that the add-ons were somehow associated with a different installation of RapidWeaver. That seemed to make sense as the error messages when I would drag the installer icon onto RW Icon on the dock I would get the attached error message.
My next step was to see if I could find (and delete) the second installation of RW. I could not find any instance of RW in my Applications folder so I searched for it using the little magnifying glass at upper right of screen (I think this called spotlight?).
The spotlight would show me RapidWeaver but never reveal where it was situated. When I clicked on RapidWeaver it just asked me if I wanted to create a new RapidWeaver project?
I click CREATE then click the ADD (+) button
I select STACKS then select FOUNDRY from the theme palette
I then click the little LIBRARY ICON at top of screen and click the folder I have FOUNDRY parked in.
Lots of FOUNDRY stacks are then presented. When I scroll down to the bottom of the list the last one I can see is the VISIBILITY stack.
At this point things get a little un-obvious. I continue to scroll but nothing from ThunderPack or PotionPack reveals itself. If I just start clicking icons at the bottom of the screen these two add-ons present themselves. I just cannot ferret out how to make them reveal themselves in a predictable or repeatable fashion. I was hoping they could somehow show up automatically in their own folder or inside the original FOUNDRY stacks folder.
I suspect the answer is somewhere at the bottom of attached palette.
It’s kind of like that last mile problem that Amazon has…
PS: I still have not figured out whether or not I have more than one installation of RapidWeaver. I cannot find it anywhere in the application folder. When I click the little magnifying glass at top right of screen (spotlight?) I can find the application but clicking on it just launches the application but does not indicate where it is located on the hard drive.