I just had this issue on TTAX Deluxe for 2021 bought as a download from Amazon. I called TTAX service and was told it was an amazon problem, amazon was firm that they could do nothing and knew nothing and it was a TTAX issue.
It turned out to be a Norton 360 issue. I needed to sleep norton and the install was OK.
In this case it was installing Deluxe as purchased, only the license code error was due files blocked on install creating bad match with the key I assume.
