can't find a purchased movie on my Macbook pro

If it's still in the store etc. : Redownload apps, music, movies, TV shows, and books - Apple Support

Sly night Said:

”I bought a movie several years ago and I can't find it on my computer”

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If you don’t recall the year of the purchase, look for a similar icon that you remember the movie having. The icons can change frequently.

And know that sometimes items are removed from the Apple Store, and they become no longer accessible. That’s just the way it is.