First, download the installation MSI
Then, run and choose your instillation directory and options.
Once installed, right click the Project Altis Launcher shortcut on your desktop and run as admin
Login to the launcher as usual, and wait for any patches to complete.
Once all patches are installed, hit the Play button on the launcher and hop right into the action!
While we currently don't support Mac, you can check out this unofficial tutorial for using Mac here.
Project Altis will not support any Linux Distro until Beta. Sorry about that!