It seems that if you have downloaded the German and EU English versions of the digital version before the 10AM CEST on Saturday May 12th, there is apparently an issue with the installer that would prevent the user from downloading all the necessary game files. The good news is that Blizzard has since released a new installer that should fix this problem so head on over to Blizzard’s website for the download links. This problem seems to have affected those who downloaded the German and EU English installer, so everyone else should be good to go.