It's not dead, it's on hiatus. I don't want to keep having to rewrite the tutorials every time there is a new version out. I've already had to rewrite them four times. I'll just wait until Construct is closer to v1.0.
Until then, use v0.98.9 to go through the tutorials. There's still some good info in there, even though some of it is outdated. There's a link in the OP.