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You have the file. Now, how do you watch it to honor the 5.1 CH specification? Simply playing it through TV speakers (which are stereo) will downmix the audio, losing the rear channel effects.
A critical point often overlooked in file descriptors is runtime. There are two major cuts of Batman v Superman:
When searching for Batman.vs.Superman.2016.1080p.5.1.CH.x264.Dublado, prioritize the Ultimate Edition. The longer runtime justifies the 1080p resolution and 5.1 audio, offering a coherent narrative that transforms the film from a flawed blockbuster into an operatic tragedy.
If your file contains dual audio (English + Portuguese), use MKVToolNix to set the Dublado track as the default. In VLC, go to Audio → Audio Track → choose "Portuguese" or "Dublado." Ensure the 5.1 channel mapping is set to "Original" to preserve the surround panning.