Of course I have the external MIDI Interface... actually, I have the two diffrent very OLD model (M-AUDIO Uno 1x1 & ROLAND UM-1x1) which in any case works well in Mac OS Sierra (10.12).
But... as I told, I found that E-50 USB Driver for...
YES... your first link works! Thank You very much...!
I found already previously USB Drivers 1.010 and 1.012... but specifically NOT that 1.011 which isone and only right, which works!
I don't wanna change my E-50 to anything...