I am running 11.2.1 and I downloaded TT back in the fall. When I tried to use TT with Big Sur it failed. I was fortunate to have a Catalina machine and did my taxes with it. Today I opened my "fall version" of TT on my Big Sur machine and was offered some updates. After accepting them I redid my taxes, as a exercise, on the Big Sur machine and came up with the same answers.
