I'm registered for the June 2026 LSAT (June 5th), which means that the Argumentative Writing should be available to complete by now. I managed to login to ProctorU, download the browser and all that, successfully. The only problem is that the website won't let me register for a new exam to be able to actually complete the Argumentative Writing. Did anyone else have this problem, and if so, how did you figure it out?