Hi @Eugene_Timmermans, thanks for trying out Stencila and for taking the effort to describe the issues that you've had. I'm sorry it wan't a smoother experience.
The Stencila Python package is tested under Python 2.7, 3.4, 3.5 and 3.6 (e.g. (https://travis-ci.org/stencila/py/builds/272782069) so you should be fine with any of those versions.
Could you copy and paste the output that you get from running these commands...
At the command line install the Stencila python package (you need to have pip installed):
pip install --user https://github.com/stencila/py/archive/master.zip
Then in IDLE, install the Stencila Python package manifest so that it can be found by the desktop:
Feel free to ping me in our Gitter chat room - https://gitter.im/stencila/stencila - it might be easier to debug any issues.