Launcher stuck at "50% Installing" for multiple hours

I Have tried multiple times to launch the Repair program, reinstall, game always gets stuck at 50%. Have let it sit for multiple hours with no change. Game is already installed, was just playing last month. Not sure what to do. It says "ST" in the bottom left corner of the window. "Installing_______Updating_____Complete" in the middle stuck at 50%.

Cant find any links to help, new player.