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

Hi,

HP Scanner 3 is part of a much older HP Software for a Mac, so there probably an incompatibility problem which should be resolved by removing any previous software.

Try following the Resolution section below, be sure to use the HP Uninstaller first and follow the steps to reinstall the software as listed, I believe this should help:

https://h30434.www3.hp.com/t5/Printers-Knowledge-Base/Having-problems-installing-older-HP-Printers-on-later-macOS/ta-p/7946104

Shlomi