After downloading a 3GB large patches came an error message about a missing .dll driver when the game starts. After hours of searching the net I was able to fix the error, it was not because of me or my computer, but at Ubisoft. The game is now only playable without sound, the last issued patches 1.6.0 after installing.
Ubisoft brings here a software out without having them tested previously and frustrated all those who wanted to use a little among others to play the free days.
I have been searching for solutions (in total more than 10 hours) in the network now had enough, because there are currently no solution to the sound problem. I will also uninstall any USB devices or my PC "bend" in any way, to get it somehow.
My advice to all those who have not yet bought not buy (the only way to Ubisoft to work better "encourage") or wait until it is playable
Update 01/18/2015
Meanwhile, the patch is 1.7.0 came out and installed - no improvement, the sound still does not work.