Version 1.1 and later of the PlayerPRO importer is compatible with 10.6 and later and has just the metadata importer that you can drag and drop to either the local or user Spotlight folder.
Version 1.0, 1.0.1, 1.0.2, etc. will run on 10.4 and later and a Universal plug-in. However, it comes with an installer that will install version 5.10 of the PlayerPROCore framework, the metadata plug-in, as well as a few tracker importers, into the local Library folder.
It is advised to use version 1.4 or later as it doesn't depend on any library or plug-ins. If, however, you have 10.5 or older and/or a PowerPC Mac, you have to use versions earlier than 1.1.