It could be useful first to create and switch to a new python virtual environment before the installation to avoid conflicts with third-party packages.
Install the plugin by executing, from the top level of the plugin directory:
pip install -e .
As a pre-requisite, this will install an appropriate version of the aiida_core python framework.
Next, do not forget to run the following command to make sure all other plugins are discovered and registered
reentry scan -r aiida