If you own a legal DVD/Blu-ray of Night at the Museum 2 that includes, say, English and Hindi tracks, you can use software like (to rip your disc) and MKVToolNix (to merge the two audio tracks into one file). This is legal for personal backup in many jurisdictions.
Many websites that promise "Free Dual Audio Downloads" are traps. They often hide malware, adware, or viruses behind fake download buttons. night at the museum 2009 dual audio download
It sounds like you're looking for a for the download of Night at the Museum (2009 dual audio). However, please note: If you own a legal DVD/Blu-ray of Night