Your explanation of the installation of the mod is completely misleading.
You say: "install the folder" extension "in the original AC-" car "folder" which suggests that there would be a folder
and in the RSR 2017 and RSR 2018 ZIPs of the mod, which is of course not the case.
I ended up finding that it is actually CREATE a new folder in the installation folder of the 2 RSR 2017 and 2018 rename it
by extension". And then we must copy the 3 files in this new folder "extension"
To enable wider lighting, you must assign a button in the control settings in Content Manager
https://media.discordapp.net/attachments/400682321428348928/602921859557752844/Sans_titre.jpg?width=1284&height=664