I answered your request already via email and asked you WHICH library (we use different installers!) you have the issue with. No answer from you yet. Instead you created this post?!? I guess you are speaking of the older installers.
You are using a custom configuration. Nebula uses your MacHD: /Library/Audio/Presets/AcusticaAudio/Nebula3 as default folder.
This is the default place and if you change things you should be skilled to look into the path mentioned above where the the installer copies your presets to!
Again, please answer our support emails first (less than an hour ago!), then post offensive stuff like
Very annoying since I guess they don't figure people might have things on other drives...
Hey, I figured to make a post on the forum since some devs (not stating you) are not that great in having prompt email responses (few days, up to a week).
Forum response has always been faster IMO.
Appologies if this came across as rude, but wasn't my intent at all. Wan't to also see if other users had the same issue or at least could resolve it (again in case it would have take a few days - know you guys are busy).