Trados 2019 - no app visible/working

Hi, I'm using SDL Trados Studio 2019 Freelance SR 2 on Windows 7. I have recently discovered that no applications installed for my Trados are seen by it. I have tried with many applications, different releases (of course, my focus is on 2019 releases) - nothing seems to work. Two years ago, I successfully installed DeepL and it's working smoothly as well as being visible in Trados. I'd appreciate help to remedy this.