http://bugs.winehq.org/show_bug.cgi?id=24623
--- Comment #5 from A Wine user RandomAccountName@mail.com 2011-04-13 16:19:57 CDT --- (In reply to comment #0)
To get the installer started, first install dotnet30 with winetricks and then set Windows version to Windows 7.
To clarify, dotnet30 and Win7 mode are prerequisites to reproduce the bug, not a workaround. (There was some confusion about that in bug 26721)