“HPDeviceMonitoring.framework” will damage your computer.

I solved this and the inability to print by following these steps exactly:

Go to 123.hp.com

Do NOT put in your printer type, instead use the "My device is not listed" link. This takes you to a more generalized tool to download.

Click the Download button. The application "HP Easy Start" version 2.9.3 will download.

Open this app... do NOT go beyond the first screen. Instead, look under the HP Easy Start menu next to the Apple menu, and select and choose "Uninstall HP Software..."

This launches the Uninstaller. Click Continue. Then it takes quite a while to remove all HP files.

When it's done, there is a button to relaunch HP Easy Start, called "Set Up New Device". Click that.

This time "Agree" and hit the Continue button. Make sure of the listed things on the next screen and click Continue.

Select your printer (mine is a printer on the network, it just shows up by its name, e.g. "Anubis") and click Continue.

Click "Install" in the next panel. The 'essential' software is downloaded, and permission must be given to proceed with installing.

Installation seems to take a long time. When it is done click Continue.

At this point you can set up Status and Alerts. I don't know what happens if you do, I just skipped that step by clicking Continue.

In the next panel, click "Add Device..." button. That doesn't take long. Then click "Print Test Page". 

If you are lucky like me that page prints. Click Continue. Next is to set up online access things. I didn't really want that, so when I clicked the "Continue Online..." button I did NOT click the "Register My Printer" button in the web page that opened. You might want to.

I confirmed that printing from an app actually works, and then restarting the computer did NOT result in the "damage" warning.

YAY.

Worked on a Catalina iMac and a Mohave MacBook Air.

Do this;

Here's what I did to solve this PER the HP website;

1) Open Finder

2) Click the "GO" menu and select "Go to Folder"

3) paste "~/Library/LaunchAgents" in (do NOT omit the tilde "~" or else you go to the WRONG place)

4) Find "com.hp.devicemonitor.plist" and REMOVE it

5) Reboot - boom the problem is gone.<---- REMEMBER TO DO THIS

I'd update your HP Drivers & Software ASAP to be sure you're all groovy and such...

Once I reboot - the message stopped displaying (click helpful if this works...)

Hello Lindenbaum,

I've just got rid of it by:

1. Using Finder to go to "Library/LaunchAgents" and moving the most recently added and suspicious looking file to the bin.
2. Did the same here "Library/LaunchDemons"
3. And here "~Library/LaunchAgents"
4. I also went to "Applications" and sorted by most recently added to see if anything suspicious has been added, and removed that.
5. Then I restarted my Mac and it's fixed!

Good luck!

The popup message appeared on my 2018 Mac mini.

Went to use/Library/LaunchAgents and deleted the file. Popups stopped. Printer also stopped.

Went to HP and dowloaded the latest driver and software. Used a USB cable, reinstalled software, driver was already up to date, re registered the printer.  Popup popped up several times during the process. Clicked OK button on popup as many times as it appeared.  Popups stopped. Rebooted.  No popups.

My computers on an ethernet network,

2018 Mac mini 3GHz 6-core i5, 32GB RAM, 250GB SSD, OS X Catalina 10.15.7

mid 2011 21.5" iMac 2.5GHz quad core i5, 32GB RAM, 240GB SSD, OS X High Sierra 10.13.6

HP Deskjet 2655 over wifi

Only the Mac mini had the popup message. The iMac did not have the popup message.

My friend had this issue as well and the answer above did NOT solve the issue.

I was able to fix the issue and get her HP printer working again.

Here are the steps I took:

1. Uninstall all HP printer software.
2. Click the "show in finder" button in the popup which takes you to the .framework files.
3. Delete all HP .framework files
4. Go to the App Store and download the HP Smart App (which is their latest driver and control set) and let it search for your printer.
5. Fixed!

P.S. Her printer was the Envy 7640, I don't know if this will work on all (especially older) HP Printers.

I also heard from Apple Support that the Amazon Music App has been creating the same problem. It all stems from Apple's new security features in Catalina that cause older drivers to be seen as threats.

Good luck all!

For my HP printer I followed the instructions here https://support.hp.com/us-en/document/c02440673

Followed the instructions under "Uninstall with the HP Uninstaller", but I had to do the manual removal portion

Rebooted - no more messages. Now I no longer have any HP software installed.

Went into System Preferences and re-added the HP printer back.

No more problems / messages. Can print.

As of Oct 24 2020 the software from HP has issues.

Tried installing the Easy Start and I started getting a pop-up with a different "will damage your computer"

Deleting the launch agent is only a temporary fix. I fixed two of my machines by deleting the HP files from the ~\Library folder where the device monitoring module is that you see the complaint about. I also deleted the printers. Then restarting. Magically, at that point Apple offers the 5.1 update for HP printers. I installed that and then downloaded new driver software for printing and scanning direct from the HP website. That took care of the problem completely each time.

Some have written that "HP Printer Software Update 5.1" appeared in Software Update; it did not for me. Similarly, the solution above (https://discussions.apple.com/thread/251948941?answerId=253720748022#253720748022) downloads the HP Easy Start version 2.9.3 to install the software; my printers are old enough that HP Easy Start cannot find software drivers for them.

The solution that worked for me is to use the link above to remove existing HP Printer software and then manually download and install the HP Printer Essentials:

1. Follow the instructions at https://discussions.apple.com/thread/251948941?answerId=253720748022#253720748022 to delete the the existing HP printer software (it will also remove the print queues):

1a. Go to 123.hp.com

1b. Do NOT put in your printer type, instead use the "My device is not listed" link. This takes you to a more generalized tool to download.

1c. Click the Download button. The application "HP Easy Start" version 2.9.3 will download.

1d. Open this app... do NOT go beyond the first screen. Instead, look under the HP Easy Start menu next to the Apple menu, and select and choose "Uninstall HP Software..."

1e. This launches the Uninstaller. Click Continue. Then it takes quite a while to remove all HP files.

2. If you want to try using HP Easy Start to install the HP printer drivers, continue following the direction from the link above. If HP Easy Start does not find your printer, or it does not find current software for your printer, then see step 3 instead.

3. Download ftp://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-S-5_14_8_4.pkg

4. Double click on the resulting hp-printer-essentials-S-5_14_8_4.pkg file and install as normal.

5. Then go to System Preferences -> Printers... and hit the "+" button to create a new printer.

Apple Support had me click on "show in Finder" on the pop up screen. You will then see in blue the file with the same name as appeared on the pop up screen. I simply trashed the file and restarted my computer. The pop up screen was gone!

Okay so I tried the solution by @Rolaa but I could not find any suspicious files in any of the locations they suggested.

My computer kept giving me the location of where the error was coming from "HPDeviceMonitoring.framework." I discovered it is in the same place as "HPDM.framework" and several other folders that will all give you the same error.

I decided to delete all of these folders (I think there were like 7 or 8 of them). **If you try to print at this point it will tell you that the driver is malfunctioning.

Instead, download "HP Easy Start" from the HP website and then click through and when it asks you what you want to install. ONLY install the first option, NOT HP scan. Once this downloads and installs, you should be able to print normally without any error.

Hope this works for you too!

There is a new software update available now for Catalina. Try installing this update. Then, update your HP drivers by first uninstalling and then re-installing the drivers using the HP_Easy_Start app. This process worked for me. Uninstalling the drivers gets rid of the pop-up windows. After re-installing, everything worked correctly with the printer. Good luck!

Open 'Finder' and go to > Apps > HP

Remove your HP Printer product software (use uninstaller from HP)

Install new HP app from the Apple app store: 'HP Smart'

and connect to your printer

link: https://apps.apple.com/us/app/hp-smart/id1474276998

The message no longer appeared. HP Printer seems to work fine.

I had this problem. On 10/26/20 I called HP and they said Apple is requiring all printers to be AirPrint driven, as of the last upgrade to Catalina OS 10.15.7. (And that is about when my annoying pop up alerts started.) So cabled access to printing won't work anymore for Macs. I have two older printers, a Color LaserJet M277dw (wireless) and an older B&W high throughput LaserJet M401n (not wireless). To switch the M277dw to AirPrint wireless, I went to Apple menu, System Preferences, Printers & Scanners, deleted my old drivers in the left column (use the minus sign at the bottom to delete), and then added AirPrint for the M277dw (by clicking on AirPrint at the bottom of the left column), so it now prints wirelessly using AirPrint. Very straightforward.

HP tech support for Apple said either Apple will have to change their policy on making all printers so they are wirelessly AirPrint driven, or I will have to upgrade my old B&W high-throughput LaserJet M401n with a wireless one like the M479fdw (color) or the M428fdw (B&W). This is only a problem for my MacBook Pro, not my iPhone, nor my iPad, both of which come from Apple programed to print wirelessly.

To get rid of the incessant pop up box, I clicked on the "Show in Finder" in the alert box ["HPDeviceMonitoring.framework" will damage your computer"] to find the offending folder and simply deleted the entire folder. I reasoned that if I upgrade so my hp printers are all AirPrint compatible, I won't need any of the hp software in those folders, and the hp tech support person said that should work fine going forward. The bad news (I suppose) is if Apple changes their mind about using the old hp drivers instead of AirPrint, in which case I would have to do an un-install and re-install of hp drivers, because I took out a file recommended in the post here and now I can't find which folder to put it back in. This won't be an issue if I upgrade my old B&W printer.

The good news is my wireless printer now works and I have stopped the pop up alerts. I'm a big fan of Apple, but I wish Apple had more robustly alerted people about this. It would have saved me a lot of time.

Finally got sick of waiting for a hot fix to appear for this - very disappointed as this is not something users should have to fix Apple + HP.

Simple steps I took to fix it:

1. So to system preferences, printers & Scanners
2. Select a printer, right click and select 're-set printing system'
3. Confirm you want to do this
4. Use the + icon to add the printer back in again (note likely it will suggest using AirPrint which is fine)

Problem has gone.

I fixed this by going to Mac HD/library/printers

and deleted 'hp'

Then I went to HP site and clicked on the download - HP LaserJet Pro M281fdw EasyStart Download

once that installed it checked and detected my printer and then installed all I needed. All is working ok now.