suanLoBeach Sorry to hear you've having troubles. Your spine-unity runtime package is too old, the Spine URP shaders 4.1 UPM package from 2023.06.20 contains some changes which require an updated spine-unity runtime as well. Please update to the latest spine-unity package to resolve the errors.
If this does not resolve your issues, please share the error messages with us so that we can see what's going wrong.
The problem of everything looking blue might be a separate issue. The blue rim light of the "URP 2D Shaders" example scene requires the rim light settings properly setup, which can be done by assigning the provided Example 2D URP Asset next to the scene asset as render pipeline asset in your Project Settings under Graphics (or Quality, if you're overriding per quality tier). It uses the Example 2D URP Renderer Data which has the Light Blend Styles setup accordingly.
