Hi all,
Unfortunately the links provided in the initial post from 2012 are not valid anymore.
Here are the new links for the installer of Padshop Pro. After the installation you have the choice to install a local 30 day trial of the Pro version on your system or to enter a full activation code.
http://download.steinberg.net/downloads_software/VSTi_Padshop/1.1.30/Mac/Padshop_Installer_mac.dmg