http://www.frenchdivide.com/a-propos/parcours/
https://www.mountnpass.com/en/evenements/french-divide-2017/
The gpx files are available. As someone said above the route is fine-tuned each year. For instance this year they took in some of the northern WW1 battlefields to commemorate the centenary.
I think riding these routes by doing the actual event is the msot enjoyable (and most resepctful) way of doing them. The camaderie between riders, the organisers and locals is huge. Locals really go out of their way to help and I ‘ve had several friends who have gone out and set up impromptu feed stations. The route doesn’t exist as a Grand Traverse/ GR path: it’s made up by the organisers who spend a lot of time and effort developing the route. There is often an article in the French 200 magazine documenting the French Divide route reconnaissances.
There is a brit this year doing it on a dinglespeed. He seemed to struggle being at the back for the first few days or so but is now massively moving up through the pack.