I`m don't understand how to make a mod, I tried to download unity and mod tools, but it comes out to be a bug:
Assembly 'Assets/Jundroo/ModTools/Editor/Jundroo.SimplePlanes.ModTools.Core.dll' will not be loaded due to errors:
Reference has errors 'Jundroo.ModTools.Core'.

Assembly 'Assets/Jundroo/ModTools/Editor/Jundroo.SimplePlanes.ModTools.Editor.dll' will not be loaded due to errors:
Unable to resolve reference 'UnityEditor.CoreModule'. Is the assembly missing or incompatible with the current platform?
Reference validation can be disabled in the Plugin Inspector.
Unable to resolve reference 'Unity.XR.OpenXR'. Is the assembly missing or incompatible with the current platform?
Reference validation can be disabled in the Plugin Inspector.

And after that, the Simpleplanes button did not appear.