It is terrible problem. I tired days on my laptop for Arty A7-100T. The board and cable are both good, but it refused to work on another laptop. I tried 2018.2, 2019.1, 2020.2, and resintall them tons of times, I tired Adept2, trieds manual intsall, everthing I can try.
The latest state is till one com port and one converter.
I am tied of it and am thinking move on to other platform, not by digilent.