To install LightUp for older versions of SketchUp without .rbz Extension support, you'll need to:
LightUp supports SketchUp 8,SketchUp 2013, SketchUp 2014, SketchUp 2015, SketchUp 2016
Back in 2010 when LightUp was first launched, SketchUp had no support to install Plugins and Extensions. This meant LightUp had to have its own installer to copy files to the correct locations.
Starting with SketchUp 2015, there is now a built-in Extensions Installer that offers a simple method to install plugins via .rbz files. It lives in Preferences->Extensions->Install Extension
We have started to transition over to using the SketchUp Extensions Installer system for LightUp. Initially it will be for the free 30-day DEMO on WIndows. Website www.light-up.co.uk
Please let us know if you have questions are problems.
New tutorial for LightUp 4.4 http://www.light-up.co.uk/index.php?t=tips
Just released the Android player for SketchUp models lit with LightUp.
You can navigate your lit models in realtime, use any Scenes you've set up and take measurements from your model.
https://play.google.com/store/apps/details?id=org.billyard.lightupplayer
Adam
THANK YOU!
I've updated the German text with what is suggested.
As you will have seen, we have been updating the website. How is it best to express in German the new English text?
https://light-up.co.uk/index.php?t=home%26amp;vc=GB
Adam
May be better to simply have a single rectangle of glass material behind this material.
The LightUp website has been spruced up for Spring, check it out: https://light-up.co.uk/index.php
Also updated iPad LightUp Player available with improved performance and fixes.
Get it here: https://light-up.co.uk/index.php?t=player
New Android LightUp Player is nearing completion and looking great.
Last but not least, a new version of LightUp for SketchUp released (v4.2e) that has improved realtime Section Planes for Poche effects, and continuous 2-point Perspective mode which is very handy when doing flybys.
Adam
FREE to develop, yes. But Its 5% royalties on shipping applications.
LightUp builds atlases internally, so you could export using LightUp using Autodesk Filmbox format (FBX) and choose 'Single Layer' and 'Dynamic Resolution' to get what you want - and you could export the Ambient Occlusion at the same time. 
LightUp also has an Editor script for Unity that makes dual layer imports very simple.
Adam
Also be aware that many raytracing tutorials use 'time-lapse / fast-forward' to avoid long delays in the video - are you sure it was really 3 seconds of elapsed time?
Adam