Unable to deactivate licence offline

Some years ago I bought a SDL Trados Studio 2019 Freelance licence and a SDL Trados Studio 2017 Starter - Free too.I activated both of them in 2018 and, as you can easily see, I've got no user available for Studio 2019 licence, since it seems still active. I've to deactivate this licence in order to reactivate in on another PC but I can't... could you please help me in solving this trouble?

Thank you so much in advance!