NGINX doesn't use .htaccess so I'm assuming that it could be a permission issue, or there is a webpage link missing.
I've done both ways, I've direct downloaded the .tar, and I've cloned the git. Both options end up the same way for me I can get to the index.php, but when I go for the installer, it 404s out...
I'm gonna try the link you included since maybe the one i used is different.