I just bought the game and got an email about it.
But the game is not in my library.

Somebody else has this problem ... or had it in the past?

Help ´d be appreciated...

That's a bummer. My suggestion would be to contact GOG.com:

http://www.gog.com/support/contact

The two times I've contacted them, they were very helpful :)

Thanks, if I actually had read through the forum, I´d have noticed, that there´s already a thread about that very problem (with other games). By now, the work-around doesn´t even seem to be neccessary.

If you use Galaxy that problem is not existent any more.