There is no "CIDFont F1" available for download because it is not a real font. It is a name created by software (like Adobe Acrobat or web browsers) when a PDF fails to embed its original fonts correctly.
If you have an old installer of for Mac, it includes CID fonts. Extract them from: /Library/Application Support/Adobe/PDFL/8.0/Fonts/ cidfont f1 font free download for mac
There is no standalone free "CIDFont F1" for Mac, but Google Noto Serif CJK or Source Han Serif will replace it perfectly. Install those via Font Book. There is no "CIDFont F1" available for download
When you see "CIDFont F1," the computer is looking for that specific map. Without the map (the embedded data), the Mac doesn't the Mac doesn't