I had problems with this issue myself. After trying all of the options posted to no avail, I started fiddling with it myself. What I did:
Run launcher, it'll stick at 60%
Open Task Manager and Kill Agent.exe
Open C:Program Data/Battle.net/Agent/Agent.868
Run Agent.Exe from this folder before it restarts itself in task manager (A DOS window will appear, let it run all the way, it will close itself)
Once it finishes, the Launcher will die.
Re-run the launcher and it should work!
Note, I ran Agent.524 first, not sure if that is a pertinent step or not, if it is, insert it before Agent.868.
If this works for you guys can you add it to the battle.net forums? I don't have a beta key.
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Run launcher, it'll stick at 60%
Open Task Manager and Kill Agent.exe
Open C:Program Data/Battle.net/Agent/Agent.868
Run Agent.Exe from this folder before it restarts itself in task manager (A DOS window will appear, let it run all the way, it will close itself)
Once it finishes, the Launcher will die.
Re-run the launcher and it should work!
Note, I ran Agent.524 first, not sure if that is a pertinent step or not, if it is, insert it before Agent.868.
If this works for you guys can you add it to the battle.net forums? I don't have a beta key.