High-quality fonts have manual "hinting"—instructions that tell your screen how to display curves without jagged edges. Cheap downloads result in "halftone artifacts" (blurry or broken lines).
I should guide them to official sources first. Let me check if TeraFont's official website offers the Kinnari Gujarati font for download. If so, the legal way would be to visit the official site and download it there. If not, maybe other platforms like MyFonts or Adobe Fonts have it licensed for distribution. terafont kinnari gujarati download high quality