Thanks Kim, Birna and Thomas.
After checking my config I've now managed to
- Connect DigCam Control via a USB lead
- Managed one session with them connected via WiFi
Via USB seemed very promising and I changed settings & took some photos
It seemed Digicam didn't like me having other devices connected by other USB sockets initially (I route my network, keyboard & monitor via a hub). Disconnecting those got me more progress and I suppose I'll generally be in "mobile" mode when I need this app
Via WiFi, I had LiveView working on the laptop & could change settings. But I lost connection - after that all attempts to connect failed (the laptop tells me it's connected D500 each time I try, but Digicam didn't believe it)
For now, I think I'll persist with Digicam & spend a bit more time learning it.
I may look at CamRanger at some stage Kim, if I hit more barriers.