As of November 2017 the All In One installer has been officially deprecated.
You’ll still be able to upgrade your install, since the underlying install of Home Assistant is a virtual environment install.
If you’re looking to perform a fresh install, then instead look at Hassbian (and then install Mosquitto should you need it), or a virtual environment install.
Whichever you chose, Z-Wave is automatically installed should you need it, and the OpenZWave control panel hasn’t been required since 0.45, and the arrival of the built in Z-Wave control panel.