You do not have permission to open the application “HP Scanner 3”.

[Suraj5189]

https://support.apple.com/en-us/HT212756

1. Open the directory /Library/Image Capture/Devices
2. Search for the application HP scanner 3
3. Right-click, and select Open Info
4. Under Sharing and  Permissions, change the one under system to Read & Write

[JazzyJeff]

I tried all of the above solutions and this one actually worked! Pasting the commands into terminal, no idea what it did, but it works!

[LookingForLunch]

Which one worked?

[TheSecretary]

This one works for me (Suraj5189 above) , but the first command is "get info", then sharing and permissions. remember to then unlock the little padlock and change the setting from read only to read and write.

Cheers

[MKM111]

It is even easier: You can just doubleclick the Icon. Actually nothing seems to happen – but afterwords scanning works.

[RHbrown67]

It works thanks so much for the link. 

[CraigET]

Have attempted to fix this issue. When I double click on the name of the scanner driver (step 4) a pop-up window opens telling me once more that "“HP Scanner 3” will damage your computer." I close this window and finder and return to attempt to scan, but still have the same problem i.e. "You do not have permission to open the application".

Am I missing something? Thanks

[Chao_L]

Apple has stated that macOS 11.6 fixes this issue in the below article. 

https://support.apple.com/en-us/HT212756 

[Sarge325]

I had the same issue using a Apple iMac and the fix was to update the software. Once completed, I just did a restart and all worked fine.

[mdelvecchio]

Between the new macOS Monterey, and the new version of HP drivers and new Easy Start, this issue has been resolved for me. I did them all at once so I don't know which resolved it.