I can't add zip file as a project

Hello everyone. It’s my third day in Unity. I’m on the “2D Beginner: Adventure Game” course. There’s a zip file within the course, and when I try to add it as a project, I get the warning “this project is not valid.” Even though I’ve extracted the zip file, I can’t figure out why this is happening. If there’s a simple solution and I’m bothering anyone here, I apologize.

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On Unity → AssetsImport PackageCustom Package
Then select your zip file.