Because CIDFont+F1 isn't a single commercial font you can purchase, you cannot simply "download" it. Instead, you must fix the way the PDF handles the missing information.
When a PDF is exported, if the software cannot properly embed the original font (like Arial or Times New Roman), it creates a virtual substitute F1, F2, F3 Cid Font F1 F2 F3 Download -
gs -dNODISPLAY -c "(input.pdf) runpdfbegin pdfdict begin /Fonts get == forall" quit Because CIDFont+F1 isn't a single commercial font you