CID Fonts – Overview, Variants (F1‑F4), and How to Obtain Them Legally
Disclaimer: The "F1," "F2," "F3," and "F4" designations found in academic papers refer to internal placeholder names generated by PDF software. They are not standalone font files that you can download and install on your computer. cid font f1 f2 f3 f4 free download link
Because these are not actual font files you can download, you must resolve the error through substitution or re-exporting. Impossible fonts to be found / Fontes impossíveis de achar CID Fonts – Overview, Variants (F1‑F4), and How