"Runs it good at max settings" he says. Ummmmmm...no it don't. It's a complete potato with 30% of the graphics power of the minimum recommended card. You're barely getting FPS in the mid teens(if that even). With frequent dips in the single digits. Don't go telling lies like that. Someone might believe it and buy one of those POS cards thinking you can actually play games with it. That' BS. It's an iGPU replacement card at best. Hell...most iGPUs are WAY more capable.
It doesn't work. Never has. Just rename the .dds and .stg files to "game_proving" and manually install them. Manually install any non-stock assets used too(if required). If it still wants to load the normal proving grounds, rename those .dds and .stg files so the game can't find them.
I have no idea how they're able to do that either.
@JustaFordGuy VirusTotal says it's ok. But I used a hex editor to compare the file to the one I downloaded and installed from the ShareMods link found here. And they aren't even close to the same. So personally, I wouldn't trust it. I don't even 100% trust the one I downloaded from the other site. But that's where I've always downloaded STM from. And it's never caused any issues before(that I'm aware of).
The smallest you height map you can download from terrain.party is 8km x 8km. That's 8000m x 8000m. A 64x64 map in the editor is ~1km x 1km(it's precisely 1.024km x 1.024km actually). So an 8km x 8km height map is going to be ~ 8 times larger than the largest map you can make it the editor. You can use the 8km x 8km height map for any size map in the editor. But the scale won't match the real world. The smaller you make the map in the editor, the worse the scaling will be. 32x32(512m x 512m) would be ~16 times smaller than an 8km x 8km height map.
TL;DR...there's no way to make a map in the editor that is anywhere near realistically in scale with the real world using the smallest height map from terrain.party. UNLESS you crop the height map to a size that matches the size of the map you want to make in the editor. A 1/8 piece of the 8km x 8km height map will be 1km x 1km(1000m x 1000m). Which would be very close in size to a 64x64(1024m x 1024m) map in the editor. So the scale would also be very close to realistic.
There's one thing I can see that's wrong with that picture.
<Cockpit _template="Default" > </Cockpit>
But you don't have...
<_templates Include="trucks" />
Which means...you're calling for the default cockpit template, but you haven't told the game where to find it.