Unzip the downloaded file and place the map zip found inside into your mods folder.
There’s a load of changes but I’m just pointing out the main ones. If you update to this you will have to start a brand new game.
New Features: Precision Farming ready with custom soil map, Requested user changes added, new areas and placeable productions, more pedestrian splines, updated to base map patch 1.41, extra paintable textures, double the terrain angles, new fill types, new grape orchard and harvester added to the store, new terrain changes, northern map bridges widened, new deco cows added to the animal dealer pens, placeables edited and much more.