I was having the same issue. I downloaded the latest version of UC (2.10), and updated Studio One Pro to 3.5.6. Ran the firmware update v3.03 on the Faderport, but still didn't see Faderport 2018 as an option in extensions, and the thing was just sitting there like a block of concrete. Then I found there is a Faderport 2018 extension, and I downloaded that, but when I looked in my extensions, it was grayed out with an error message. It took me a while, but finally saw that at the top of the update box there was a small message that said I had to restart Studio One for the extension to take effect. After I did that, the FPv2 seems to work OK. Try all those steps, and you may get lucky!