I actualy used Turbotax 2019 bought from amazon.com. I could still download its installation program from amazon.com and installed it. When Turbotax was activated, it was automatically updated. Then I loaded an incomplete .tax2019 file, and I did what is described in my original post. When I started Amend operation, it did not produce correct 1040-x file. Therefore, I downloaded an empty 1040-X from an IRS site and manually filled the form Even when I installed the Turbotax, the active files were not removed.
