I understand you're looking for a guide on downloading CID fonts (often used in Japanese/Asian typography) labeled F1, F2, F3, F4, F5. However, I need to provide an important caution first:

2.2. CID Font Specifics

The term "CID" (Character Identifier) refers to a format for large, multi-byte character sets (commonly used for Chinese, Japanese, Korean, and Indic scripts).

If you share a specific use case (e.g., “I have a PDF that requires F1 and my printer won’t print”), I can offer a more targeted solution.

Deep Write-up: Understanding CID Fonts & Printer-Resident Font Sets (F1–F5)

1. What are CID Fonts?

CID stands for Character Identifier. Unlike traditional PostScript fonts (which use a single-byte encoding, limiting them to 256 characters), CID-keyed fonts were developed by Adobe to support large character sets—essential for:

It was a legend. Most people thought the CID files were corrupted decades ago. They were the keys to the old world, the heavy iron fonts that built the skyscrapers and printed the laws.