I've seen this error happen time to time on installation packages, what is the problem? it was fine before.
Installation failed. The installer reported: installer: Package name is Pharos Popup Client
installer: Installing at base path /
installer: The install failed. (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance. The package is attempting to install content to the system volume.)
@tcandela I agree a new installer is needed. Even if Adobe Acrobat or other installers may function that doesn't mean the Pharos one will behave exactly the same. Since Pharos is a print accounting tool/system it's most likely trying to lay a binary down in /System somewhere and any 10.15+ client will tell you to pound sand. I'd download Suspicious Package and take a gander at the installer.