Since I cannot provide a direct file transfer, you can download the verified font from trusted Tamil font repositories. Here is how to do it safely:
The original "Ka Naazhigai" sometimes falls under a different family name due to licensing changes. Verified mirrors are often maintained by: ka naazhigai tamil font verified free download
Once you have the verified .ttf file, follow these OS-specific steps: Since I cannot provide a direct file transfer,