I am having the same problem as jadams 4 months ago:
Does not work! I am getting this error "Please select one scrapbook folder and try capture again."
even though I was following the installation instructions point by point.
More specifically, when opening the ScrapbookQ sidebar it is completely empty (except for the filter icon, search field, and search icon). No folders, not even something that looks like a root of the Scrapbook tree! Also, right click does not allow to create any new folders.