I already have installed twinmotion, but in 2019 version. I received an email saying that as an early adopter I could access the upgrade for free, but I didn’t understand if I need to uninstall my current version and download twinmotion 2020.1 or I can just upgrade by logging in or something
Each major release is a separate installation. This is true for both Twinmotion and Unreal Engine.
In the future, please post all Twinmotion questions and issues to https://twinmotionhelp.epicgames.com/s/