I changed the ModDesc.xml as follows and now it works:
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<modDesc descVersion="99">
<author>No_Creek_Farms</author>
<version>1.0.1.0</version>
<title>
<en>Ray County Missouri</en>
</title>
and copy the terrainShader.xml from where the game is actually installed FarmingSimulator25/data/shaders/terrainShader.xml that seems to do the complete trick.
Hope no-creek-farms updates the modDesc.xml file asap for an updated download.