I tried and found this solution to work in 10.5.3
First: get the latest software for 2110;
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=mp-42166-1 &lc=en&cc=us&dlc=en&product=79488&os=219&lang=en
Then mount the dmg: 2100
790EN.dmg and launch the installer and when it is about to finish installing, you will get a notice that trap monitor has unexpectedly quit then click ignore. quit installer, set up assistant will pop up for you, it may not find 2110 so quit the setup assistant.
The software are installed fine but won't find the scanner though... but do the next step
Get the software for DeskJet F4280 AIO;
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=mp-58668-1 &lc=en&cc=us&os=219&product=3390949&dlc=en
mount the dmg: HP
Installer_DJF4200v9.7.1.dmg and lanuch, it will ask you for the device, select "device not listed" but the second time it ask you to pick a device shown as listed, pick the only one shown then continue to finish installing... when done.. it will attempt to start the HP Setup Assistant. It won't find the PSC at all so quit the HP Setup Assistant
then go to HP folder inside the application directory and then open Device Utilities and drag "HP Setup Assistant" to desktop or to trash but don't empty it yet.
then back to 2100
790EN.dmg and mount it and don't run the installer but do "Show Package Contents" then open "Contents then "Sub Installers" then "Setup" then run the "Setup" installer
It will install the HP Setup Assistant is specific for 2110 not the F4280
When done, quit the installers.. You may trash the HP Setup Assistant that is on desktop and empty it.
Then go to HP folder then open Device Utilities folder and run HP Setup Assistant, it will find 2110 and continue finishing setting up.. then NOW you have Leopard compatible softwares! Now try HP Scan Pro and enjoy!
I hope this is clear 🙂 Have a great week! I have been racking my brain on finding a way to get it work in Leopard and found the solution! I am like why can't they update the installer to newer one and fix the trap monitor or whatever..
I will continue to use this software I Installed till HP release a official software for 2110 then I'll uninstall and install that but until I am enjoying my solution now.
Let me know how you all fares after this! Cheers!