@zZSleepyHeart your project is most likely using Unity's Built-In shaders. You'll have to upgrade your project to use the Universal Render Pipeline.
Some helpful links:
https://mekartikshah.substack.com/p/unity-guide-to-converting-built-in
https://unity.com/resources/how-to-move-from-built-in-to-urp
This is it. It's the Las Vegas Skybox. It is $15. If you buy it, please link it here. I want it too...
https://assetstore.unity.com/packages/2d/textures-materials/sky/cityscape-skybox-ii-88056#reviews
