When you are trying to locate raw images in the DNG converter, are you just choosing the FOLDER and not opening the folder? The DNG converter works at the folder level, and if you open the folder you will be notified that there are no files to convert.
Apologies for my late response. Your suggestion worked on a borrowed
laptop and the problem I now have with my PC is that the Adobe panel
does not display the final line of options that would allow me to
proceed with conversion.
Try changing your screen resolution to a higher resolution in your system settings.
The screen resolution is at it's highest of 1920x1080.