Search for " The Chronicles of Myrtana: Archolos " on the Steam store. It is listed as a separate, free game. Click "Add to Library" and install.
For the best experience on modern hardware, it is highly recommended to install the Clockwork Edition of the DX11 Renderer . This improves performance and adds modern lighting effects.
Ensure you are running the game or your launcher (Steam/GOG) as an Administrator .