All credits go to the team at virtualdrivers.org. This pack of skins was originally included with the Clio Cup 197 car, only that it needed manual unpacking to use them.
So in order to keep the car file light, facilitate installation and make future updates easier, the skins of the French Championship are presented as a separate archive.
As for all other skins : unpack to \assettocorsa\content\cars\renault_clio_cup_197\skins
The French Championship [CDF], at virtualdrivers.org
Here are the beauties, all 64 of them .