Okay so I downloaded the launcher yesterday and played for about an hour, no problems at all. All the errors and issues I had at that point were sorted and it just took me a few tries to get on the server. I've wen't to play today and the usual launch stuff is happening. No way to play, just the usual buttons and no attempt to connect to the server

I've wen't through as many replies and stickies as I could, I've relaunched about 50+ times and even sent the launcher and files up again correctly. I have no idea who to turn to and I deeply apologize if this has been explained anywhere, I just really want to play!
Edit: After leaving the game on for about 25 seconds without doing anything, it came up with an error box saying "authentication failed, now closing program" and I couldn't do anything but quit with the game, really strange!