Lr 6.0.1
J'ai d'autre part trouvé cette réponse de DxO :
Thank you for writing. The new version of Lightroom is not yet included in the capabilities of Optics Pro regarding the Export to Lightroom function in the program. It will be added to the program in a future update to Optics Pro. In the meantime, if you use the 'Export to Application' function in Optics Pro instead of 'Export to Lightroom', and choose the new version of Lightroom, Lightroom CC/6 will be started once processing of your images is completed by Optics Pro, and the processed files passed on to the new Lightroom for you. I have confirmed that this procedure works on my systems here.
I have informed the developers about the issue you are having with the new version of Lightroom. Thank you for the information you provided, I will be happy to pass it along. If any additional information is needed, we let you know. The developers did want me to assure you that they will make every effort to provide an updated version of Optics Pro that is compatible with the new version of Lightroom as quickly as possible. Since this problem is noted in the developer's system, we will go ahead and close this ticket for you in order to simplify tracking the problem through our systems here.