I'm asking my friend to give me a zip file of all the his stuff in folder Battle.net\Client .
It's late now so I'm going to try this tomorrow. Will let you know once there is a result.
I'm still stuck by this issue and tried every other solutions mentioned above but none of them worked.
I see the way you fixed this issue and want to have a try.
But gamefront seems like a website in German which I don't understand.
Could you give me the link in which I can download launcher (1574) and agent (954)?
Thanks a lot!
Taking a copy of a working ProgramData\Battle.net folder worked for me.
For some reason the Launcher wasn't updating to the latest (1575) and the installer bombed out. As soon as I grabbed the battle.net dir from another computer it started installing just fine.
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