Chanakya is not a Unicode font. It uses a proprietary encoding. This means if you type "A" on your keyboard, it might display as "अ" on the screen, but the computer internally stores it as "A". If you send a document typed in Chanakya to someone who does not have the font installed, they will see random English letters (garbage text) instead of Hindi.
The font is generally considered Abandonware . The original company (Walkman) stopped supporting or selling it years ago. However, it is theoretically copyrighted software. walkman chanakya 901 hindi font download
Installing a legacy Hindi font on modern Windows operating systems is easy, but you must ensure you install it "For all users" to work with DTP software. Chanakya is not a Unicode font