To watch Lucifer with the best audio and video quality ("better" than unauthorized downloads), you should use official platforms that support multiple languages.
Stop looking for a phantom Season 15. Start enjoying the brilliant conclusion of Lucifer Morningstar in on the six seasons that actually exist. That is the only way to get a better experience.
While some fans may be searching for a "Season 15," this likely refers to the show , which famously ended with its 15th season and featured its own version of the Lucifer character. The Real "Lucifer" Season Guide
Netflix provides official Hindi dubbing for the series, including the final season.