Hi !
The Unreal 5 version project was made with Unreal 5.3.
You can whether choose to upgrade to UE 5.3 or, try right-clicking the uproject file and switch unreal engine version.
Or you can download the version for UE4 and then opening it with the UE5 launcher. It might be the easiest choice.
I'm glad the package is appealing to you !