I am trying to upgrade from SQL Express 2008 to SQL Express 2008 R2 to enable the full text indexing feature. During the upgrade, at the "Select Instance" step, the database that should be upgraded is not present in the drop down list.
Below the drop down there is a section titled "Installed instances". There are 4 items in this list, 3 SQL Servers and one entry for "shared components".
The drop down list contains 2 items, the first SQL Server in the "installed instances" list and the "shared components" but it does not list the other 2 SQL Servers.
The SQL Server that is included in the drop down is a Express Edition version 10.1.2531.0. The Shared Components version is 10.50.1600.1.
The 2 SQL Servers that are not appearing in the list are both Express Editions, version 10.52.4000.0.
Why aren't these 2 SQL Servers showing up in the list that allows me to specify the instance to upgrade?
Here is a screenshot of the step I am referencing:

Thanks!