xyris: It should happen automatically. The game uses same save folder as the demo.
Bearhug_at: Thank you mate, you're right.
I didn't knew that as I posted the question because I have some issue with the third-party game provider I purchased it from. But they work on the problem now to fix it.
Meanwhile Instant Kingdom helped out.
They gave me the fastest response I ever seen in customer report and be much more charming then most mega-sized sweatshop Molochs out there.
By the way, if you like game soundtracks as I do I recommend to buy it from the game developer site for just $5.- via Paypal or cc.
It's a steal for a wonderful music. Common, support your independent musician :)
Thanks Bearhug, we were happy to be able to help you out. :)
And I fully agree, Gareth Meek is definitely a very talented musician, who deserves the support! I have some experience about being a musician (well, almost), and even if you're very talented, it's a pretty tough field, especially financially. And in addition to this, working with Gareth was amazing - it was just so effortless, and he had such a wonderful attitude!
Here's a link to
Gareth's bandcamp site where he sells the Driftmoon sountrack (all profit from it goes directly to him).