Downloading "free" movies from unverified sources like the one mentioned in your subject line——is highly discouraged because it exposes you to significant security and legal risks. The Risks of Illegal Downloads
: Pirated "MP4" files are frequently of low visual and audio quality compared to official releases. Where to Safely Watch Karthikeya 2 (Hindi)
Instead of risking your device, you can watch Karthikeya 2 in high definition on official streaming platforms where the movie is currently available: