I am trying to install TFS 2012 RC and while is copying files showed the below error:
"Error: TF400534 : Package (tfs_servercoreres_x64) caching failed"
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I had the same error and fixed it reinstalling tfs express. My installer was corrupted. So, Re-download it from Microsoft official site here: http://www.microsoft.com/visualstudio/11/en-us/downloads#tfs
Also, remember that The user account to install it should be a member of the Administrators group.