Installation with conda

To install the latest Gammapy stable version as well as the most common optional dependencies for Gammapy, first install Anaconda and then run this commands:

conda config --add channels conda-forge --add channels sherpa
conda install gammapy naima sherpa \
    scipy matplotlib ipython-notebook \
    cython click reproject iminuit

To update to the latest version:

conda update --all
conda update gammapy

Overall conda is a great cross-platform package manager, you can quickly learn how to use it by reading the conda docs.