The installer and software works on Mac OS only. You can invoke the installer by double-clicking on the file, which will launch the Installer application with the .dmg file as its target. The Installer application takes you through the install process from that point.
We certainly plan on a universal AAX plugin, but I cannot give you a projected time, with apologies. Watch this space, though. When the day comes, it will be announced here. Many thanks for your interest.