I've installed "joomla-pkg_gantry5_v5.0.0-rc.2" but when I try to enable all of Gantry's associated extensions, I only get error message.
When you install Gantry it will auto-enable itself like the Gantry 5 package with the green checkmark. The others are also enabled but they show the LOCK symbol indicating that is a protected file and that it's "state" can't be altered by the user.