I'm experiences the same issue after importing unity 2d extras, my unity version is 2019.4.40f1 LTS. After installing git and adding its path to the environment variables I'm try to import the package ...
Unity version 4.3 is coming this fall and bringing with it new official tools to support 2D gaming projects. While many 2D titles have been made in Unity, the engine itself is primarily built for 3D ...