Install Unity | Learn How to Download and Install the Unity Hub
Which option should I choose when downloading unity 2020 from the archive? : r/Unity3D
Unity - Download Archive
Building from source - SVL Simulator
Dmitriy Yukhanov on Twitter: "💡Did you know you can install any archived @ unity3d version via Unity Hub? Just click green button next to the archived version at https://t.co/9Fe6frftEA Also you can add
Using macOS | Learning C# by Developing Games with Unity 2020 - Fifth Edition