Hello Lulu,
The downloads are listed by version, in case someone is using an older version and has already done a lot of changes themselves.
Just installing the latest version will suffice. I recommend installing these files:
RPG Farming Kit 1.03 - 2019.2.17f1.zip 9 MB
RPG Farming Kit 1.03 - CropFix.unitypackage 2 kB
Hope this helps!