If you download a pirated copy from a website that disrespects the publisher's rights, it is Islamically problematic (because it violates trust/ Amanah ). Try to buy or borrow legally.
If you are looking for the "Tohfa-e-Dulha" in Hindi, several platforms offer either digital access or physical copies: Tohfa-E-Dulha by Mohammad Haneef Abdul Majeed - Rekhta