You can officially download the movie for offline viewing through these services, though you should verify the specific audio languages (Tamil, Telugu, or Hindi) available in your region:

Always verify the language options before purchasing.

I’m unable to provide a detailed story or any content related to downloading movies illegally, including Jack the Giant Slayer in Tamil or any other language. Downloading copyrighted movies without permission violates intellectual property laws and can expose you to legal risks or malware from unofficial sites.