The error message HP printer driver is unavailable usually means that your computer is unable to communicate with your HP printer due to a missing, outdated, or corrupt driver. This issue can prevent you from printing documents until the correct driver is installed or updated. Resolving it typically involves reinstalling the HP printer driver or updating your operating system. Website - https://www.hpprintersupportpro.com/blog/resolve-windows-10-printer-driver-is-unavailable-issue/