shp2D3

Convert a 2D ESRI shapefile to 3D using a Digital Elevation Model (gadl formats)

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This plugin requires pyshp library previously installed.  

On windows: 
1) install python (if you do not have already installed) - (http://www.python.org/downloads)

2) install pip using the get-pip.py script (http://docs.python-guide.org/en/latest/starting/install/win/)

3) open command prompt

>> C:/PythonXX/python -m pip install pyshp


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On linux 
use the package python-pyshp

e.g on debian/ubuntu distribution 
sudo apt-get install python-pyshp