Some older printers (especially PostScript printers) have their own internal font libraries. If your document uses a "TrueType" font that the printer doesn't recognize, the driver triggers this warning.
Warning: Outlined text cannot be edited as text (searching, copying, spell-checking will fail). Download Font Substitution Will Occur Continue
Look at the warning details to see the name of the missing font. Look at the warning details to see the
Text might get longer or shorter, pushing lines onto new pages. However, be aware that your document’s formatting might
Clicking "Continue" won't harm your computer or your file. However, be aware that your document’s formatting might "reflow." Lines might break differently, and headers might look slightly "off" because the substitute font has different widths and heights than the original.
Here is a quick breakdown of why this happens and how to handle it like a pro. Why it’s happening