Just updated MAC Catalina OS and now HP printers won't work.

[minot1]

My HP Deskjet 4400 won't work after updated to Catalina on my MAC. Apple says its HP's fault. I say it is Apple's fault

[BryanCustomPure]

The solution is to download (and install) this package which will update drivers AND THE CERTIFICATE:
ftp://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essen...

It is NOT the same as the driver package, Easy Start, or Easy Admin other people are recommending.

If the link comes up blank, try right clicking and saving it. If you install this package and still have trouble, try uninstalling your printer and reinstalling by going through Apple Logo (Upper Left of Screen)/System Preferences/Printers & Scanners.

Easy Admin did nothing. Easy Startup did nothing. 5.1 drivers did nothing. This worked for me!

If this solved your issue, please thumbs up and mark as solved!

[minot1]

Bryan: Thanks for the help but that link won't fully load for me. It stops about 3/4 of the way and tells me an error has occurred. 

[BryanCustomPure]

Try this set/order I just updated in the last yesterday:

Use the HP Uninstaller: https://support.hp.com/us-en/document/c02440673
If you still have a folder marked HP, delete it (it's likely in your libraries folder).

Use Easy Start (https://support.hp.com/us-en/drivers/selfservice/hp-easy-start/7376041 - make sure your OS is correct) and see if your printer is supported. If not, move on to the next steps.

Uninstall your printer USING THIS METHOD ONLY (NOT EASY START, NOT EASY ADMIN): Apple Logo (Upper Left of Screen)/System Preferences/Printers & Scanners. Then restart your computer.

Download (and install) this package (From HP FTP) which will update drivers AND THE CERTIFICATE:
ftp://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essen... If the link comes up blank, try right/control clicking and saving it. Or right/control click and copy link, and paste into browser bar. If you get the malware warning part-way through the installation, go to System Preferences>Security & Privacy where you can tick a box and unblock the HP option.

The install takes a bit. Let it run, even if it seems like it stalled out! When it completes, restart.

Then reinstall your printer using: Apple Logo (Upper Left of Screen)/System Preferences/Printers & Scanners, and use the default drivers. If drivers do not show up, download and install the 5.1 driver package from here: https://support.apple.com/kb/dl1888?locale=en_US . Then restart your computer.