Thanks. So here's what we have.

When I choose the Aux software the responses are
2022-10-14T22:51:32: [ERROR] Cannot continue without connection to motor controllers.
2022-10-14T22:51:32: [ERROR] Got no response from target ALT or AZM.

whereas before I got simply can't connect with the "standard" USB port. So it seems we've made progress; don't know what to do from here.

In the port type there is a selection between AUX/PC and USB/HC. Don't know what this means. Seems to make no difference.