Realise your question was a long time ago, but if you have a Guitar Pro license
and you log on to the Guitar Pro website right now, you can download the
entire mysongbook.com contents as a zip file - it's about 150mb, but doesn't
take too long with broadband.

Once you unzip it, it's nearly 2 gigabytes; takes a long time to unzip. When
you unzip it, it is all in folders like the website - first by category, then
by artist.

Good luck.