I wrote a little program that will switch the active version of LumenRT between LumenRT 2015 and 2016 (Connect Update 1). You can download the program here:
Just place the program on your desktop or where ever and run it. It requires that you have both LumenRT 2015 and 2016 installed.
a new version is available now. You can download it using this link.
a new Build with numerous fixes is available.