David,
Thank you for reply.
I realize that this might be tricky.
I believe Native Instruments (in Komplete) has the preview file folder that syncs to their online "master" set once in a while.

I think the easiest solution for PG would be to have the updated and complete downloadable "preview files" folder somewhere on the site that also would have info on exact size when unpacked. And so that folder gets updated if previews are changed or added. So if your (my) folder is less, I would just download and replace whole preview folder.

P.S. Thank you for the tip on "Play using current chordsheet for song" next time I will try that if style preview is missing.