Download Font Substitution — Will Occur [work]

: Double-click the font file and click Install Font in Font Book.

The warning usually triggers because the required font files are missing from the local computer or weren't properly embedded into the document [19]. This is common when: Download Font Substitution Will Occur

E. For printing servers or shared systems : Double-click the font file and click Install

is not a minor glitch—it is a warning that your document is falling back on a guessing game. For personal use, it may be an occasional nuisance. For professional publishing, legal documents, or brand-sensitive materials, it is a red flag demanding immediate action. For printing servers or shared systems is not

: The document calls for a font (e.g., a specific TrueType font) that isn't installed on the printer's hardware.

Search for the font name in a web browser. Reliable sources for free or paid fonts include sites like Google Fonts or DaFont.