I have identified the issue and it will be fixed as soon as possible, hopefully in a few hours. I'll post in the release topic when it is fixed. Until then, you can fix the issue by installing the following packages manually if you have not already done so:
http://www.microsoft.com/en-gb/download/details.aspx?id=35
http://www.microsoft.com/en-gb/download/details.aspx?id=30679
The RC2 installer erroneously attempts to install both at the same time, whereas only one simultaneous installation is allowed. That causes one of both installations to fail.
Thanks to everyone who helped me debug this issue by reporting on IRC/PM.
(Crossposting this to all related topics.)
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