To ensure stability for older projects, you should use the to manage your versions:
The 2020 release cycle introduced several key updates that remain useful: unity-pro-2020-free-download
While there is no legal "free download" for a standalone Unity Pro license, there are legitimate ways to access Unity's professional features or use the engine for free for your projects. To ensure stability for older projects, you should
Are you working on a that requires the 2020 version, or are you just getting started with game development ? Unity download archive To ensure stability for older projects
: Better tools for artists and designers, including verified Cinemachine and 2D enhancement.