Hi after i finished playing Skyrim i wanted to go back and play Morrowind again but i found that there is no cd key written on cd or on the case and i dont remember how i did instal it back then. Is there any way i can get another cd key if i send pictures of the game cd and case as a proof that i bought it or i must buy it again somewhere? Thanks for answer.

You dont need CD key to instal it.