I've downloaded some of the 1.6.4 modpacks and I've been trying to launch them, but when I press "launch" the console reads "beginning authlib authentication attempt", then "successfully created YggdrasilAuthenticationService", then finally "using authlib authentication data", then a bunch of stuff pops up on the console for literally only half a second, of which I'm too slow to copy down, then both the console and launcher close without any notice. Nothing happens after. I've reinstalled the launcher, allocated more memory to the launcher, and basically everything I can think of, but I'm not a tech wizard so I haven't thought of anything significant to do. Hopefully you guys can answer my question because I've been trying to fix this for almost a week, I've asked questions all over the place.
Thanks.
Thanks.