As of now, kinact is not yet a proper python package available via pip. Therefore, the installation is a bit more tedious, but should nevertheless be more or less straightforward, since kinact does not need any fancy dependencies.
Open a command line or terminal window. You can clone the repository using git and install the package:
git clone https://github.com/saezlab/kinact.git
cd kinact
python setup.py install
We are working on it :-)