A legitimate Ismail font usually supports Arabic diacritics, ligatures, and Latin counterparts. Pirated versions often strip these essential characters, causing your text to display as random symbols or "tofu" (empty boxes).
Once you have downloaded the font file (usually a .ttf or .otf file), here is how to install it on your operating system: Ismail Font Download
: High-resolution vector files for the name "Ismail" in Arabic Thuluth calligraphy are available for commercial use at Names in Arabic . If you'd like, I can help you find: A legitimate Ismail font usually supports Arabic diacritics,