InReach Sync unable to find Explorer +

I have Windows 10.  I have tried everything listed from reinstalling to turning explorer on or off before connecting.   I tried different USB ports and different cables.  The Explorer+ does show charging when connected to the cable.   It will connect to earthmate on my phone.  But the link for a firmware update from earthmate gives a 404 (not found) error.

Is using a usb cable & computer the only way to undate firmware?  If so, what do i need to try now?