To my understanding Style packs (xpro, etc) do not contain audio data. They are compositions / instructions that make use of existing audio / Midi content, chords, mixer settings.

I have all the style packs and extras I bought as installers in one folder. Most users can download these from their "My Products" page.
My plan is when HD arrives to uninstall everything related to PGM. Do a clean install of Flac version and install all the xtra packs I bought on the top.