Please read the manual (Manual.pdf on this repository)
CPlantBox-Dumux is currently not available on windows. Some pointers to setup a linux environment on windows are given on the CPlantBox-wiki https://github.com/Plant-Root-Soil-Interactions-Modelling/CPlantBox/wiki/Help-for-windows-users
If you have ubuntu >= 20.04, you can download the python file "installDumuxRosiWithUbuntu2004.py" from the CPlantBox repository https://github.com/Plant-Root-Soil-Interactions-Modelling/CPlantBox This file is based on the dumux installation file. run: python3 installDumuxRosi_Ubuntu.py
It will create a "DUMUX" folder and install inside the dependencies necessary to run dumux-rosi. This script might work on other linux OS but has not been tested.