Failed to update to SQL Server 2012 RC0

I am trying to upgrade to SQL Server 2012 RC0 from SQL Server 2008 R2 Enterprise but it keeps failing and always shows a Rule Check Result error box stating that “Rule “SQL Server 2012 RC0 Feature Upgrade” failed. The specified edition upgrade is not supported. For information about supported upgrade paths, see the SQL Server 2012 RC0 version and edition upgrade in Books Online.” Aside from this, the rest of the rule has passed. How can I get out of this error?

