Here are the instructions for installing and running the newest update.
You can download the file from the link below.
Before clicking the link below make sure to remove the green_derby.zip or green_derby_demo.zip files from the mods or repo folders.
Download Link Update 10.5.8 File
DO NOT UNZIP
This zip file needs to be placed in either "C:\Users\username\AppData\Local\ BeamNG.drive \0.23\mods\repo " or "C:\Users\username\AppData\Local\BeamNG.drive\0.23\mods\" folder.
Startup BeamNG to activate the mod.
1) Click the "Repository" button.
2) Select the "Mods Manager"
3) If the green_derby mod is marked "Deactivated"
4) Click the Activate button
5) Click "Play"
6) Click "Scenarios"
7) Find the scenario labeled "Demolition Derby - The Fair Grounds 10.5.8"