When I deactivated SDL Trados Studio 2021 and activated SDL Trados Studio 2019, I didn't succeed. Then I went to SDL web page and saw that my license is in use (in factor, I have deactivated all the SDL Trados Studio softwares in my computer) and none license is available. So I reset my license but it showed error in resetting. How can I deal with this problem? How can I succeed in activation of SDL Trados Studio 2019?