have installed HP 7800 envy printer for home use. when it was installed our HP5600 stopped working on this computer, I need to be able to use both
Open >System Preferences>Software Update (Command R will reload and do a fresh check)
Update: HP Printer Software 5.1 should now be becoming available through Software Update to fix this issue.
(2220 UTC 23 October 2020)

or Apple direct download:
https://support.apple.com/kb/dl1888?locale=en_US
If you have continued issue:
The solution is to download this package which will update drivers AND THE CERTIFICATE:
ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-S-5_14_8_4.pkg
download link above at the ftp address
If you still have an issue, and listed as AirPrint printer, delete the existing printer in
> System Preferences> Printers & Scanners, and add it again, select AirPrint.
Connect an AirPrint printer to a Wi-Fi network - Apple Support.
https://support.apple.com/en-us/HT201900
about AirPrint
https://support.apple.com/en-us/HT201311
you can also try reset print system if necessary:
If you can't print from your Mac or iOS device - Apple Support
Open >System Preferences>Software Update (Command R will reload and do a fresh check)
Update: HP Printer Software 5.1 should now be becoming available through Software Update to fix this issue.
(2220 UTC 23 October 2020)

or Apple direct download:
https://support.apple.com/kb/dl1888?locale=en_US
If you have continued issue:
The solution is to download this package which will update drivers AND THE CERTIFICATE:
ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-S-5_14_8_4.pkg
download link above at the ftp address
If you still have an issue, and listed as AirPrint printer, delete the existing printer in
> System Preferences> Printers & Scanners, and add it again, select AirPrint.
Connect an AirPrint printer to a Wi-Fi network - Apple Support.
https://support.apple.com/en-us/HT201900
about AirPrint
https://support.apple.com/en-us/HT201311
you can also try reset print system if necessary:
If you can't print from your Mac or iOS device - Apple Support
have installed HP 7800 envy printer for home use. when it was installed our HP5600 stopped working on this computer, I need to be able to use both
