The search for a is a search for a solution to a problem that has already been solved. While the Harikrishna font was a pioneer, its non-Unicode technology is now a liability. You can still find and download the original font from several online archives to access old documents.
While many websites offer individual font downloads, the most efficient and common method to get the full Harikrishna set is by downloading a containing multiple fonts. Here is a step-by-step guide to a safe download and installation: harikrishna gujarati font free download patched