Voor de gene die er interesse in hebben:
DirectX9 unattended installation:
Download the redist version (32MB)
Extract the files with Winzip.
Once you have a Direcxt9 and a License folder copy the DirectX9 folder to your directory from where you want to install it unattended.
Rename the Directx9 folder to DirectX
Then find somewhere the redist version of DirectX8.1 once extracted find the dxsetup.exe copy the dxsetup.exe from DirectX8.1 to you DirectX folder and overwrite the dxsetup.exe file.
Once done, you can use "dxsetup.exe /install /silent" to install DirectX9 unattended.
Dit werkt perfect.