DxO PhotoLab was unable to start. This is usually because DirectX 9 is not properly installed

1 / Go to the website of the manufacturer of your graphics card, download and install the latest driver for your graphics card

2 / Rename the file "C:\Windows\System32\D3DX9_42.dll" in "C:\Windows\System32\D3DX9_42.dllold" and install directX from the attached file