1. Copy contents of extracted folder that includes a folder and theme file to Windows>Resources>Themes>
2. Open up folder for M11 Theme and click on the Visual Style inside.
3. If UXtheme has been patched the new visual style will be added to the list.
4. Look through list to find visual style, hint if the Visual Style entries read
Windows
Windows Vista Basic
Windows Standard
Windows Classic
You are at the bottom of the list with the Windows Aero Visual Style...scroll up into entries that read just Windows Aero and Windows Vista Basic for the Visual Style M11 entry.
5. Apply the chosen Visual Style and Enjoy.
Not the M11 Theme but you get the picture on this step
Those this is all dependent on the UXtheme.dll and the other two being replaced with the Within Windows (website) files.