UPDATE. Ok I managed to solve it. I used CCleaner to completely uninstall the StudioPowerPack2021_16.1.7.1848 plugin.
However I would appreciate if anybody shares further recommendations on how to avoid this issue in the future or fix it without having to uninstall. Or any other information that can be useful or relevant to this case. Cheers

Hello Stepan Konev ,

I had just tried to replicate this, but couldn't.

It would be good to know if you used the app store integration, or downloaded from the appstore direct as there are crucial differences- depending on your version of Studio (Help -About Trados Studio)

https://appstore.sdl.com/language/app/sdl-trados-compatibility-and-migration-power-pack/1101/

Hello Stepan Konev ,

I had just tried to replicate this, but couldn't.

It would be good to know if you used the app store integration, or downloaded from the appstore direct as there are crucial differences- depending on your version of Studio (Help -About Trados Studio)

https://appstore.sdl.com/language/app/sdl-trados-compatibility-and-migration-power-pack/1101/

Hi ,
I use Trados Studio 2021 SR1 - 16.1.8.4404
I had StudioPowerPack2021_16.1.5.1835 installed and functional. I rarely get WSXZ jobs, but today I received such a job and decided to make sure that my plugin is up to date. It wasn't. I used Trados Studio interface to install the updated version (StudioPowerPack2021_16.1.7.1848).
So, I used the app store integration. Once the installation process was complete (with no errors), I started Trados that ended up with the above mentioned error.