Within DxO PhotoLab 4 select Check For Updates - found under the Help menu on Windows and the DxO PhotoLab 4 menu on Mac - and install the latest update if there is one available.
If your copy of DxO PhotoLab 4 is up-to-date, then most likely you own an older release which does not support your camera or your lens. We suggest that you download a trial version of DxO PhotoLab 4 to check whether your body-lens pair is supported.
You can purchase an upgrade to the latest major version from your customer account at a discounted price. Please note that upgrade pricing is only available if you own a paid license of DxO OpticsPro or DxO PhotoLab.