Problems with Textures

Ive Bought a 3d model pack and its not showing up it just looks like a a plane colour with no textures this also applys for the default textures eg grass hill it just shows up with green all the 3d models have there correct textures but the floor are just 1 colour with no texture ive redownloaded unity and used all the packages so iam not missing anything can u plz help

iam useing unity free version this could have somthing to do with
modle package medieval enviroment package

yes its that 1 and its not the modles its the ground all the modles are %100 fine. When u go to paint the textures on it come up with 1 colour eg green not varation

iam talking about the ground not the modles