To use this file go to file>user preferences in blender. click add-ons. Click install add-on from file. Then choose the blender lite file. To export your model to blender, open your file in mecabricks. Click file>export, choose .collada(dae) and, if you wish, logos on studs.
Open the template file you downloaded with blender lite in blender. Then click file>import>Mecabricks find your mecabricks file and click open. Now your model is in blender, and you can position it to render.
Hope that helped, there are some other topics under the Model Export and Render Category in the forum that could also be of help.
Have fun 😉

where do you find the file>user preferences in blender?