More data on my previous post about unable to access internet in VM after moving Parallels .pvm file to external hard drive. When I brought up Parallels for the first time from the external hard drive, it said it duplicate MAC address detected. Following the advice online, I selected "Generate new". I don't know if that was the right thing to do. I notice that the MAC address in Windows 10 does not match the MAC address on my iMac.