It is still possible to get a new Duplicate Cleaner Pro 3 licence (usually because you want to run Duplicate Cleaner on Windows XP).
Simply purchase a Duplicate Cleaner Pro 4 license if you haven't already, and drop us a support message with your details. We'll send you out an additional key which will work in version 3.
If you already have a version 3 licence but have lost the key, try here: