These labels are , not actual font files. Therefore, searching for "F1.ttf" will yield nothing. Instead, you need to install the original CID-keyed fonts that the document expects.
stands for Character Identifier . It is a font format (CID-keyed fonts) primarily developed by Adobe for handling large character sets, most notably for East Asian languages (Chinese, Japanese, Korean). cid font f1 f2 f3 f4 free link download
If you have ever worked with , AutoCAD , or professional typesetting software (like Adobe Illustrator or InDesign), you might have encountered the error: "Missing CID Font: F1, F2, F3, or F4" . These cryptic names often leave users frustrated, especially when a document fails to render text correctly. These labels are , not actual font files