Hi Nio,
From Steve's post:
1 .Download the latest build from the FSS store...go to "My Account"
2. Double and Triple Check that your current version is installed in a sub directory of program files.
3: Open your current version of the "Fixer" and select "uninstall libraries" - if you run FSX using multiple user accounts follow the instructions in the manual!
3a: Go to Windows Control Panel and "Programs & Features" "Uninstall a program" and select Steve's DX10 Fixer and uninstall
3b: Reboot computer
4: Select the latest version of the installer you just downloaded and "Run as Admin"
5. Enter license if prompted.
5:Reboot Computer
6: Right click the Fixer icon that should be residing on your desktop, and select advanced, tick the box "Run as Admin"
7: Reinstall the libraries in the fixer and check your other options.
8: Run FSX and make sure all is good.