I can't find the error in the setup here, but just in case I've rebuilt the installer. Try re-downloading the DD3 Setup and running it again.

Here is the updated symbol catalog that includes the monochrome version of the symbols. It's gonna go into the installer in a bit.

Are you always saving in the Dropbox? Can you change to a "normal" folder on your drive, e.g. under My Documents?

Try running CC3+ "as admin" by right-clicking the desktop shortcut and under Properties set it to "always run as administrator". Any change?

Looks like the floorplan of a church or temple to me. :)

Medio has graciously allowed me to use his custom artwork in tomorrow's live mapping session on YouTube. We'll also make them available for download, so you can use them yourself.