: Double-click the file and click Install Font in Font Book.

You can find the font through various community-shared repositories. While it is not always available on major commercial font marketplaces, users often access it via shared drives or design-specific platforms:

Because 4C Abhishek is a legacy font, text typed in it may not display correctly on the web or in emails without the font installed. 4c Abhishek Font Download - Google Docs