How Can I Convert SQL Server 2012 Version 11.0.3000.0 to SQL Server 2012 Version 11.1.3000.0?
It looks like you are already at Service Pack 1 (this is why MSSQLSERVER is checked and greyed out). 11.0.3000 and 11.1.3000 are essentially the same thing, different files just have different reasons for exposing a different number in the middle - that number is really not relevant to your problem.

So now you just need to download and install the latest CU or, if you really want CU #4 specifically, you can download that here (just keep in mind  you are missing a boatload of fixes if you limit yourself to that update).

P.S. you check the version of SQL Server by opening a query window and running:

SELECT @@VERSION;


The method you're using now checks the version of Management Studio - these are client tools that can be older or newer than the server service itself.