Unless you have a specific development or hobbyist need, buying a certified Android TV device is cheaper, safer, and less time-consuming than hunting for an ISO.

Because Google does not provide a standard "ISO" for consumer TVs, users typically access Android TV 13 through developer tools or community-modified projects: Android 13 for TV

If you own a certified Android TV device (Sony Bravia, TCL, NVIDIA Shield, Xiaomi Mi Box S, etc.), wait for the from your manufacturer. You can sideload OTA updates (usually in .zip format) from the device’s support page.

: Version 13 added more ways for users to interact with their devices, focusing on accessibility and input management.