xgrg You're having issues, because you're deviating from the official install guide.
xgrg Error: Failed to execute 'claimInterface' on 'USBDevice': Unable to claim interface.
That error is because you have another program or service running on your PC which is interfering with webUSB. Restart your PC and open only the web installer and this forum.
xgrg I will try once on each with usb debugging enabled
USB debugging should be disabled. Once again, please follow the install guide closely, and do not deviate.