Searching for a "CID font f1 ttf free download" usually happens because you've encountered a missing font error while opening a PDF
(IPAex, IPAGothic)
If you encounter this name, you likely see an error message or "dots" instead of text because your system cannot find the actual font data.
18;write_to_target_document7;default18;write_to_target_document1a;_K7jsaePGK47IwPAPr52s8QQ_20;4c85;0;4c47;
"The download link is broken." Solution: Font websites move files often. Use the secondary mirror:
: "F1," "F2," etc., are temporary names assigned during PDF creation.