Always download from official sources (Google Fonts, GitHub, Adobe). Avoid shady "free fonts" websites offering "cidfontf1.exe". The links provided above are 100% clean.
Some software renames fonts to things like "F1" or "F2" to save space or for technical encoding, especially for complex character sets. cid font f1 f2 f3 f4 free download link
Noto Sans CJK (by Google & Adobe) – Free, open-source, covers all weights. Always download from official sources (Google Fonts, GitHub,