Of course it is possible, third party modules need to be installed with a tool such as pip, then they can be imported. For example if we want to use module unidecode that we find in the python package index, we can open a terminal (or cmd console) and type (on my system, pip for python 3 is named pip3)
And what should I do when I get the following message when I want to install a module
Third party modules don't need to be referenced in the python package index. You must know something about this quakelib module, otherwise you wouldn't try to install it. Use what you know and search engines to find its source code. For example if you find a git repository, you can clone it or fork it and you can install it manually if it has a setup.py file by typing
python setup.py install
in the directory containing this file. If you want to modify the module, you can install it in development mode with python setup.py develop instead.