Import animation..must be marked as legacy....

Hi! I am new to Unity but i have problem no and i am Appreciate if someone can help me..

when i try to import animation that I download free from Unity market and will import then, when i import then and hit play button doesnt see the animation run, error and that said "the animationclip run used by the animation component "name" must be marked as legacy"

Check my picture below.

Theproblem

I have tried to follow This guide too but the "Animation Type " doesnt shows up in this meny he mean, Maybe he run old version of unity.

Appreciate if someone can help me that should be awesome because i will learning unity.