Exchange 2013 RTM Install Error

RTM install error: The signature or catalog could not be verified or is not valid

The error occurs irrespective of the version of Exchange 2013 .You have to run the command sn.exe on servers that support non-public Exchange 2013 beta code to indicate that it's OK to run its binaries without verification as otherwise installations are likely to fail due to "unhandled exceptions".

This command is included as a part of the Exchange pre-requisites.

The correct command is: Sn.exe -Vr *