No, downloading movies from unauthorized third-party sites is illegal and can pose security risks.
Downloading copyrighted material from non-authorized sources is illegal and supports piracy. Film Overview
If data conservation or restricted internet access is the primary reason you are looking for a 480p file format, official mobile applications provide built-in tools to resolve this issue:
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Semantic is available at semantic-ui.cn a mirror site hosted inside China. This should make browsing much faster for those visiting from mainland China.