For example, if a user wants to be able to import settings and signatures from V11 to V12, they can do so through the registry editor.
You can rename the Foxit PDF Editor 11.0 Registry Hive to Foxit PDF Editor 12.0. You can then right click> export
After installing Foxit PDF Editor V12, you can navigate to the Registry Editor and import that registry hive. Restart the application and all settings and signatures will be imported over. The additional registry keys that are new to the V12 build will rebuild in the imported hive after restarting the application.