Hexa Client on Linux
The Linux version is coming soon.
Hexa Client will be available for Linux (64-bit: Ubuntu, Debian, Fedora, Arch and others) as .deb, .rpm and AppImage packages. Check the Download section of hexaroid.com.
More in Getting started
Install Hexa Client on Windows
Download the installer, get past SmartScreen and choose whether it opens with Windows.
Install Hexa Client on a Mac
Drag the app to Applications and open it the first time with a right click.
Your first game
Sign in, pick a version and press Play: the launcher installs the rest.