Install JoomlaLMS_1.2.0_TRIAL do not work

[serviceplus]

I installed the incube loader, then I call the joomlalms_helper.php --> all cells in the table are paint in green - success in all points.

Then I go to "next" - JoomlaLMS package was found and all of the printed directories are writealbe,... alltogether should be fine,...

But when I go to "next" again, it takes a little bit, the machine is working, then I see a grey screen with two pictures (the top of a rounded corner window) and nothing more...

The installation stops, and nothing is going on...

What do I wrong? Please help, I should get that quizz working till sunday to make a presentation.