No, don’t run the old installer. Just right-click the installer itself. That will let you see the folder and file hierarchy inside the installer. There should be a folder that says “Payload”. In there, you will find folders for Presets and Grooves and the actual files inside those folders. You can copy those to your BFD3 Users location in Documents.
In this location, create a folder in user Presets and name it BFD Percussion. Create another folder with the same name in user Grooves. Now drag the preset and groove files from the “payload” section of the installer to their respective folders that you just created. Rescan all Content Paths in BFD3.