concrete5 should be available here again now.
The only issue was dreamhost decided they'd like to change the permissions on the /files/ directory and concrete5 needed to be tweaked to allow that. You don't need to patch anything or be concerned about "security issues". This wasn't some thing that was "discovered", it was simply the way concrete5 has been built for years.
5.5.2 should provide the level of flexibility dreamhost wanted in terms of configuring file permissions.