The best course of action is to be patient. Follow official news from 20th Century Studios and Disney for any updates on the Alien franchise. In the meantime, enjoy the original Prometheus and Alien: Covenant on legal streaming platforms like Disney+ Hotstar or Amazon Prime Video, where you can often find them in high quality with official Hindi audio.
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Depending on current licensing agreements, these films are regularly available on major streaming platforms: The best course of action is to be patient