Download Forgeur de clés, KeyForge online
The app updates itself every time it starts. It gives access to the same lobby as this website.
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Other systems
Installation
Windows: right-click the file > Extract All, then run ForgeurDeCles.exe. If “Windows protected your PC” appears: More info > Run anyway.
Mac: open the file, drag ForgeurDeCles into the Applications folder (required for updates), then the first time: right-click > Open > Open. If macOS refuses: System Settings > Privacy & Security > “Open Anyway”.
Linux: unzip it, then in a terminal run ./ForgeurDeCles.x86_64.