No problem, basically you just have to replace the package name with an url to my code version. So for the default instructions: https://home-assistant.io/getting-started/ replace ‘homeassistant’ with ‘https://github.com/aequitas/home-assistant/archive/dsmr.zip’. So
pip3 install --upgrade https://github.com/aequitas/home-assistant/archive/dsmr.zip
This will replace your currently installed version with the one with my changes.
If you just like to try it out without modifying your own installation try installing it in a virtualenv: https://home-assistant.io/getting-started/installation-virtualenv/ again replace ‘homeassistant’ with the url.