Follow official website instruction to install miniconda :
https://docs.conda.io/en/latest/miniconda.html
In Anaconda Prompt:
conda create --name strawberry -c conda-forge -c openalea3 openalea.strawberry -y
conda activate strawberry
git clone https://github.com/openalea/strawberry.git
cd strawberry
python setup.py develop
conda install -c conda-forge pytest