Scroll down where they have a screenshot of their graphical user interface, and download the DMG from the link right above that.
Toolkit install instructions Requirements 6.11 My game looks pixelated and the display resolution is limited.6.9 My game won’t boot anymore even though I made no changes.6.8 My game won’t run because it requires Mono.6.2 Steam crashes straight after opening.3.3 Epic / GOG.com / Amazon Prime Gaming support with the Heroic Games Launcher.1.7 Ensure the toolkit is already on latest version.