Downloading the file is only the first step. To ensure it doesn't get downmixed to stereo: Use a Flash Drive

A dedicated test video sends an isolated signal to each individual speaker one at a time.This allows you to verify that your cables are connected to the correct channels. Why Users Search for "Patched" Test Videos

If you find that your test video is failing (e.g., your rear speakers are silent, or dialogue comes out of the front left speaker), here are the immediate fixes to apply:

They function by circumventing software licensing restrictions, which may violate the terms of service of your operating system and hardware.

The term "patched" might refer to a modified version of the test video that has been altered to work with specific devices or software. However, without more context, it's difficult to provide more information on what a patched version entails.