When I use the direct link from ArchiCAD, it still opens Twinmotion 2020. How do I get it to open Twinmotion 2020?
I think you mean it still opens in 2019.
There is a new direct link for 2020 that you need to download and install.
You can have both the 2019 and 2020 direct links installed at he same time.
The menus will have different names but the toolbars look identical - so be careful.
If you want to remove the 2019 direct link, I believe it is just a matter of deleting the add-on from the add-on folder (there is no uninstaller that I know of).