I think I have fixed the AppZapper workflow to work in Leopard.
Place the workflow in ~/Library/Workflows/Applications/Finder
You might also want to place it in /Applications/AppZapper.app/Contents/Resources
I'm not sure why, but the old one worked fine from the automator editor, however running it from the context menu did not work. I added a command to open or activate appzapper at the top of the workflow and it seems to work now.
Place the workflow in ~/Library/Workflows/Applications/Finder
You might also want to place it in /Applications/AppZapper.app/Contents/Resources
I'm not sure why, but the old one worked fine from the automator editor, however running it from the context menu did not work. I added a command to open or activate appzapper at the top of the workflow and it seems to work now.