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Ahh I see.

That sucks, favoring one service more than others. Shame really, GS is a really great game.
It's here! The GOG version now has finally all the bonus stuff released up to now - including the halloween and christmas bonus levels for 2012 and 2013 (correct me if I'm wrong). :)

See also for more info: http://www.gog.com/forum/giana_sisters_series/merry_christmas_from_the_giana_sisters_and_the_owlverlord/post7