Apocalypto is copyrighted by Touchstone Pictures and Icon Productions. Downloading a full MKV file from an unindexed server without paying for it is illegal in most jurisdictions (including the US, EU, and UK).
When you click on an open directory link, the server logs your IP address, time, user agent, and what file you accessed. Unlike VPN-protected torrenting, direct HTTP downloads from random servers leave a clear, undeniable log of your activity with the server owner. Intitle.index.of Mkv Apocalypto
If you are after the pristine, uncompressed MKV experience, buy the Blu-ray. A used Blu-ray of Apocalypto often costs less than $10. You can then legally rip it to an MKV file using free software like MakeMKV (which is legal for personal backup in many countries). This gives you the exact file you were hunting for—without the guilt or risk. Apocalypto is copyrighted by Touchstone Pictures and Icon
Open directories are rarely maintained. They are often: posing privacy/security risks for site operators.