I did not want to make stuff complicated on purpose, so I apologize.
I cannot quite fulfill your request but I will try to explain.
This is valid for all the recent uploads I did:
Get the respective track at
https://assettorallygrb.wixsite.com/rallygrb/home and install it the way you prefer.
Try it "as is" if you want to - checking if it works properly.
Then in the zip files you usually get 4 files:
- "logo.png" - copy it into the ui folder of the track - now you get a sort of track logo in the loading screen.
- "ui_track.json" - copy it into the ui folder too - it replaces the original and adds coordinates etc.
- "vao-patch" file - copy it into the main folder of the track.
- "ext_config.ini" - create a folder named "extension" in the track folder - put the config file into it, together with the elusive "highlands.dds".
I will not include the highlands file with my uploads everytime, because it "belongs" more or less to Kunos themselves.
But chances are you already have it somewhere in other track mods. Try to search your assetto track folder for it.
I'm quite positive that for example the Lime Rock mod tracks have the file in ther respective extension folder included.
A lot of copy and paste work, I know but then again it's all just done by manual installation in the assetto folder, no CM involved.
Also: You do not have to use all 4 provided files, if you don't want a logo, leave it out, if you don't need coordinates etc. keep the original json file, the extension works without the vao and vice versa ...
Let me know if this helps, cheers!