You often see references to "F1, F2, etc." in printer logs, PostScript errors, or file dumps.
If your PDF specifically looks for /F1 /F2 etc., you can use FDK (Font Development Kit for CID-keyed fonts) to rename the PostScript full name. However, for 99% of users, simply installing the above fonts will auto-map F1–F7 correctly when the PDF is opened in Acrobat, Chrome, or Ghostscript. You often see references to "F1, F2, etc
Before downloading anything, you must understand what these "F" numbers mean. You often see references to "F1