Step 1 - Download installers & create folders

Download Installers

Download Loader files from https://github.com/AstunTechnology/Loader/archive/master.zip, unzip and place in the following folder:

d:\astun\tools\loader-addressbase

Download the AddressBase Importer files from https://bitbucket.org/astuntech/addressloader/get/cc6d85ec5ee1.zip, (for EPOCH 39 or later AddressBase files) unzip and place in the following folder:

d:\astun\tools\addressloader

Install Loader

1. Install GDAL and Python using the OSGeo4W Installer from http://trac.osgeo.org/osgeo4w/
2. Download and run the OSGeo4W Installer
3. Choose Advanced Install
4. On the Select Packages page expand Commandline_Utilities and select gdal and python from the list 
5. Install pip to allow you to install lxml
   • Python 2.7.9 and later (on the python2 series), and Python 3.4 and later include pip by default, so you may have pip already, if you don't see the pip usage message when you run pip from the OSGeo4W Shell then install it as follows:
     1. Download the script get-pip.py as detailed in the pip documentation
     2. Open the OSGeo4W Shell (Start > Programs > OSGeo4W > OSGeo4W > OSGeo4W Shell)
     3. Change to the folder that you downloaded get-pip.py to (if you downloaded to C:\Temp then run cd C:\Temp)
     4. Install pip by running python get-pip.py
     5. To install lxml run pip install lxml

Create Folders for AddressBase Premium Importer

Now you need to create source, output and tmp folders under the folder where you have unzipped Loader e.g. 

d:\astun\tools\loader-addressbase\source
d:\astun\tools\loader-addressbase\output
d:\astun\tools\loader-addressbase\tmp