Here's the soloution, it's relatively easy.
Create a CMD file with the command line to install the msp patch, then right click on the cmd file and select Run as Administrator.
Details:
Open Computer > C: click Organize > Folder and Search Options
Click the View Tab uncheck Hide extensions for known file types, click ok
Right-Click on empty space in the folder Window, Click New > Folder on the context menu.
Type SP1 and press enter to name the folder, press enter again to go into the folder.
Right-Click on empty space in the folder Window, Click New > Text Document on the context menu.
Erase New Text Document.txt and type a name for the cmd file like Install SP1.cmd and press enter.
Right-Click on Install SP1.cmd and Click Edit
In the Notepad window type msiexec /p c:\SP1\CGS12SP1LMP.msp
Note: If your patch file has a different name replace CGS12SP1LMP.msp with the name of your patch file.
Click File > Save (Close notepad if desired)
Copy the downloaded patch file into the C:\SP1 folder.
Right-Click on Install SP1.cmd and click Run as administrator
You will be prompted to confirm the elevation to administrator and the rest of the process is exactly like it would be on XP