yes this is exactly the problem I was having with Windows 7. It started by me uninstalling version 3 of the client and since there is no separate uninstall for the 3.0 live and 4.0 beta BOTH clients get uninstalled with the built in windows uninstall control panel. For whatever reason this folder gets corrupted and the .NET installer then has a hard time installing itself. I even tried the .NET 4.0 beta 1 but of course you guys do not use this version of the framework so I uninstalled it. But after following the steps above 2 times it finally got past the install application error pop-up and now I can successfully login.
In the future of this development 4.0 client I would STRONGLY recommend you guys provide a version 3.0 and 4.0 uninstaller that says "Curse version 3.0" or "Curse version 4.0 beta". The uninstall only says "Curse client" and it uninstalls BOTH the versions. This is very bad.


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Adamar ModeratorIf you are unable to install Curse Client v4, it is often due to a corrupted Microsoft ClickOnce app store.
This issue can be resolved by doing the following:
On Windows XP: %userprofile%\Local Settings\Apps
(e.g. C:\Documents & Settings\Username\Local Settings\Apps)
On Windows VISTA / 7: %userprofile%\AppData\Local\Apps
(e.g. C:\users\Username\AppData\Local\Apps)