i am trying to install the new version 4.0.3 MAC on MacPro OS X 10.6.8. Processor 2x 3 GHz Quad-Core Intel Xeon. Memory 9GB 667 MHz DDR2 FB-DIMM.

The previous version of LRTimelapse 3 worked beautifully... together with Lightroom 3

The installation goes well, untill I want to open the LRT software...

LRT4 need a mac OS 10.7 or younger, see http://lrtimelapse.com/eula

Either you upgrade your macos or you would have to use the old version, but that would require a license then because it's not publicly availiable as free test version anymore.