Adobe has been doing testing of all Creative Cloud Apps, including Lightroom CC/LR6 and Photoshop CC and W10 is now reflected in system requirements alongside W7 & W8.
For more information see W10 Compatibility Blog & FAQ
Try to disable thr GPU support in the LR settings
Thanks for your answer but I have no time to even click on the menu as soon as the video pops up it is impossible to do anything... I should find the reason why this video freeze the program...
Try Pressing ESC as soon as the Video Comes up when you open Lightroom.Then disable Lightroom GPU from Preference>>Performance.
Hope this Helps
you have to do this setting one time.
I should find the reason why this video freeze the program...
But you must have the time to try the tips you get here to find a solution.