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I don't see it when i select French language in my account library, in the Witcher 3 description. However, i can see the patch for all other languages. Bug or the patch will come later ? : /
As far as I know(and tested a few) you can download the patch off any language tab, they are all the same download!
When you select "French" in language, you cannot download 1.06, but only 1.05. The name of the downloaded file is 1.05 patch, not 1.06.

Error in download link on the page ?
Ce problème est toujours d'actualité, mais effectivement le patch propose bien le français même si on le récupère dans une autre langue.