IR C5051 not printing pdf using usb

[wcanonw]

The printing kit sometimes appears if you have permission or license, press the counter check button, check device info, see if it appears for usb pdf or ps.
The other way would be for a technician to check some options in service mode or to check if it has the other expandable ram memory (if it has two ram memories, it means that it has a printing license) but the technician has to also verify in the license service you have; I have seen some licensed used printers, which on the back covers are like stickers or silver adhesives that say ps or pcl printing kit

[KenP]

How can I install PostScript and where can I get it?

You need to order it from an authorized Canon dealer