If the HP printer driver is unavailable, it means that the driver installed for your printer on your computer is either incompatible or outdated. Another reason for facing this problem is you have installed a corrupt driver for your printer and your computer is not recognizing it, hence you are getting a message that HP printer driver is unavailable.
What do I do when my HP printer driver is unavailable?
Why is my HP driver unavailable?
How do I install HP printer driver?