So after installing everything, the setup shut a message that the client tools couldn’t be installed, because there’s an older version already installed.

Name: Microsoft SQL Server 2005 Tools Express Edition
Reason: Your upgrade is blocked. For more information about upgrade support, see the “Version and Edition Upgrades” and “Hardware and Software Requirements” topics in SQL Server 2005 Setup Help or SQL Server 2005 Books Online.

Build version check:
Your upgrade is blocked because the existing component is a later version than the version you are trying to upgrade to. To modify an existing SQL Server component, go to Add or Remove Programs in Control Panel, select the component you would like to modify, and then click Change/Remove.

The client tools which were installed by the Visual Studio blocking the setup tool to install the management studio etc. After some research in Google, I found the solution for this problem on the MSDN forums.

You need to start the setup from the command line with the parameter “SKUUPGRADE=1″ to force installing the newer versions of the client tools:

cmd>setup.exe SKUUPGRADE=1

So if you like to use the database in case of a sample application like EAP from Trivadis, you need to install it separately.

Ged Mead run into the same problem and posted the answer: “How To Install the AdventureWorks Database in SQL Server 2005 Developer Edition“.