You can install GETTSIM easily using conda, the standard package manager for scientific Python libraries. If conda is not installed on your machine, please follow conda's installation instructions.
With conda available on your path, installing GETTSIM is as simple as typing
conda install -c gettsim -c conda-forge gettsimin a command shell.
To validate the installation, start the conda Python interpreter and type
import gettsim
gettsim.test()