Same here. Even just verifying my email address just to even post here I'm getting the 503 error along with the 'out of date' browser es2015 support. Even when I do get the page working after several reloads, it doesn't load correctly. Please fix this issue as soon as you guys can - I'm researching game engines for a few of my family members for them to use and I'm afraid I'll have to go with something else if this doesn't get resolved soon.