Liveupdate Administrator not managing Mac definitions

Hi

My Liveupdate Administartor (v2.3.1) server is not managing its downloaded Mac definitions.  While the LUA application claims to have only 13GB of stored content, there are over 100GB of old OSX and OSI files on the local disk.

I'd appreciate some help with these questions:

1. Can I manually delete the old Mac defs, or does it have to be done via the LUA application?

2. If I wanted to stop downloading the Mac defs completely, can they just be removed from the Distribution Centre, Download and Distribution Schedules, or do I have to delete all the tasks and set them up new ones?

Thanks