Your Devanagari (Hindi and Sanskrit) font could not be downloaded from https://github.com/googlefonts/noto-fonts/raw/master/unhinted/NotoSansDevanagari/NotoSansDevanagari-Regular.ttf
What should be done to solve this issue.
@johnpeterm Google changed the folder structure for Google Fonts several months ago (stopped using master and started using main for its primary branch. Pressbooks 5.18.2 and later include the proper links/references. Easiest way to fix this is to update to the latest version of Pressbooks. Here’s the change that fixed it in inc/class-globaltypography.php: Update version and localizations (#2101) · pressbooks/pressbooks@555024f · GitHub
thank you…very much helpful