Thanks for the prompt response. Just so I'm clear:
1. Power on Vega, and then set USB Debugging to ON
2. Power off the Vega
3. Bring the Vega up into Recovery Mode by the use of the Back and Home buttons procedure
4. Connect the Vega to the PC via the USB cable. (or should this be before step 3?)
5. Ignore all messages from the Windows OS about Found New Hardware and drivers etc.
6. Launch AUDI
Is that it?