Did a clean install and yes the mod tool works, but as last years version indeed. I guess this will do for now, don't think there were significant updates to the game apart from the new content. Can't seem to find a log for it either, they would have probably mentioned it otherwise.
@tattoo I think I found a workaround in the "SpinTiresMod How To Install and Discussion"
Still having some fps issues and I might have got a few useless shaders in there, the effects should only be 10 or so. If you want I can post the link to where I got the pack and maybe someone can clear the useless ones out.
I think I got something to work. Apparently I was missing the reshade-shaders effects and textures. When I installed reshade separate from st mod it couldn't download the shaders so it left me only with an ui, no tools. I then found those textures and effects and redirected the paths to them from reshade extension.
So now I can fiddle with all those presets (yikes!)
Right, so I used MudRunner.181119.LAAPatched.exe to run the game, didn't really notice a difference. It's the same file I found inside the spintires mod win32/mudrunner folder. I was trying to figure out if this can solve the flickering trees/bushes/rocks/textures on some tracks. Maybe there's another way?