That's worked I got the Catharsis ending ! The option is not "invisible" but I can only skip down with the keyboard like you said. I don't know why, I've never had THIS bug with Bugtesda but I've finally my true ending.

Thank you for your (quick) help ^^

Well, 3 saves for 1 : before the BG speech, after the cinematic and after the fight.

Hello, I'm a french player and I finish my first run last night with the Brave New World choice. This morning I reload before the Black Guardian speech : a first time with only the "Next" options, he tell me that I can interrupt the Cleansing and diying in the process, a second time I use all the "M...