Hey, I am getting the same error "Assets/Standard Assets/Scripts/DragRigidbody.js(31,22): BCE0019: ‘isKinematic’ is not a member of ‘UnityEngine.Component’. "
i had found this thread, but above mentioned link isn’t available any more.
Please tell me how you had removed that error?
So maybe you just need to type-cast the component as a Rigidbody, or you are obtaining a component that is not a Rigidbody, and that’s the reason it can’t find that member.