This from Lutron if you having trouble downloading Essentials

If the RadioRA 2 installation or RadioRA 2 program displays any error message about Microsoft SQL
Server 2008, please try the following procedure:
1) Navigate to the Windows Control Panel to “Add or Remove Programs” (on Windows XP) or
“Uninstall a program” (on Windows Vista and Windows 7)
2) Remove/uninstall the RadioRA 2 program
3) Remove/uninstall all references to Microsoft SQL Server. This can include the following items:
WARNING!!! Other software installed on your computer may depend on a specific instance
of SQL Server. You may have to reinstall this software for it to work properly after
performing these steps.
a. Microsoft SQL Server 2008 *
b. Microsoft SQL Server 2008 Browser
c. Microsoft SQL Server 2008 Management Objects
d. Microsoft SQL Server 2008 Native Client
e. Microsoft SQL Server 2008 Setup Support Files
f. Microsoft SQL Server 2005 *
g. Microsoft SQL Server Native Client
h. Microsoft SQL Server Setup Support Files
i. Microsoft SQL Server VSS Writer
* Note: You may need to run steps a & f multiple times to remove each instance that is
installed on the machine.
4) Reinstall the RadioRA 2 program
How can I participate in helping Lutron further improve the RadioRA 2
Essentials software installation process?
After a failed installation, please zip up and email the following folders to [email protected]
for analysis. Make the email’s subject contain “Failed RadioRA 2 installation files”:
1) C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\
2) C:\Program Files\Microsoft SQL Server\MSSQL10.RADIORA2\MSSQL\Log\