Here are some legitimate platforms where you can stream or purchase the movie:

Downloading copyrighted content from unauthorized sources is a violation of digital laws. Where to Watch Ta Ra Rum Pum in 720p/1080p Legally

The 2007 Ta Ra Rum Pum was a medium-budget film that relied on theatrical and home video revenue. Today, sequels or remakes are unlikely because the film didn’t achieve blockbuster status – largely due to piracy at the time of its release.

If you’re outside India, use a VPN set to the US or UK to access the film on YouTube or Amazon.