Problem with the clinet

Can someone help me with this problem, because I did everything right. I tried to download it over and over again, but that message keeps appearing. Not even Slayer can help me with this problem, and my antivirus isn’t the problem either.

Unfortunately… we do not have a fix for this error at this moment in time, at least two other players are also having the same issue. When we have a fix we’ll make sure to update you.