The German publisher sent them the German game, which is not the Gold Master version btw, that is the 505 release.
After the European release, all previous versions (the German one) get a patch that updates them to Gold Master status.
From what i have understood it was the German publisher that wanted an earlier release than others got, and that resulted in the version PCGamer got.
If i am correct, this beta patch they have been sent is the beta-version of the patch that is supposed to bring 'German old version' to Gold Master status.
So in a way it is not PCGamer's fault, but honestly: you can't expect to get a working game if the installation is giving errormessages too?
Ohara from BIS thought it might have been a misprint on the DVD that causes the problems as well.
Anyways, i'm still not too worried and i'll wait for handson reports from German gamers or from other magazines that got the 505 release to review.