The software is typically for Indian citizens. You do not need a license key. Click "Accept" and download. The file size is approximately 150 MB to 300 MB.
Here is a comprehensive look at the Bhasha Bharti software, its legacy, and how to get it running on modern 64-bit systems for free. Bhasha Bharti Software For Windows 10 64 Bit Free
The file is likely a 16-bit or 32-bit stub. Right-click the installer > Properties > Compatibility > Select "Run this program in compatibility mode for Windows 7" and check "Run as Administrator." The software is typically for Indian citizens