I've followed these instructions, and 2 things happen.
a) Black screen with chatbox and "Nightly SA Build 1.0" bottom right. That's all.
b) Same as above, except there is sometimes a progress bar with "0 out of 555 bytes complete". It's frozen and never moves.
I've waited for 10 minutes with no activity. Just the same old screen.
I've read about old "acl.xml" causing black screens, but I don't think it applies to fresh installs. Either way, deleting it then reinstalling the nightly build doesn't help.
This is "mtasadm-1.0-r574.exe".
Also, this is what is in the console