Jriver help with macbook?

[Mille162]

Tried their FAQ forum, google, reading hundreds of related posts but I’m still stuck...I can’t get jriver to recognize my portable device.

-Astell & Kern AK380 portable player (latest software)
-JRiver MC24 installed and loaded with music.
-MacBook Pro High Sierra (10.13.6)
-using AK USB cable, android transfer opens and I can load/delete the music manually so I know the issue is jriver not seeing the player and not a hardware issue

When MC24 is opened, and AK380 is plugged in it's not recognized automatically as it should be.

When MC/Options/Handheld/Device Management is pulled up, I get "(No handhelds present)"
If I use "Add device", nothing is found
If I use "Redetect all devices", nothing is found.

Can anyone suggest a way to get my AK380 to be recognized and sync'd with MC24 (or possibly an older version)?

If you know this to be NOT possible for some reason, open to suggestions on which software to use for library/organization and syncing.