Where is my movie rental?
Did you click on the rentals tab in your Movies category?
iTunes: How to resume interrupted iTunes Store downloads
It seems this is a long standing issue that Apple has failed to resolve. So sad that people are paying for these movies and cannot view them,. Fix it asap or give people their money back.
Apple are not here, these are user-to-user forums.
If the rental isn't on the device/computer that you rented it on, and it hasn't expired, then contact iTunes Support via your account's purchase history or the emailed receipt
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