First, install the Input System package. Open the Package Manager from the main menu by selecting Window → Package Manager. In the Unity Registry section, find the "Input System" package and click "Install". Next, go to the project settings via the Edit → Project Settings menu. Select th...
but instead open it. It contains the exact version numbers you need to install for these 3 dependencies. Then go to Window > Package Manager, and install the exact same versions of Cinemachine, 2D Pixel Perfect and PostProcessing as specified in the manifest. Some of these may not be compat...