To have your BFD Eco content available in BFD3, head to Tools > Set Up Content Locations, click 'Search Folder' and select your 'BFD Eco' folder in Finder/File Explorer. 


In Tools > Set Up Content Locations click 'Add BFD2 Paths'. All data paths (content locations) currently specified in BFD2's settings are read and added as BFD3 content locations. In addition, BFD2's system and user documents locations are also added as content locations so that all Presets and Kits available within BFD2 are also available in BFD3's Browsers.