A physical tabletop RPG version named "Greyhack RPG" is available for free as a PDF on itch.io , but this is a separate pen-and-paper experience, not the digital simulator. Key Features of v0.7.x
The version series around v0.7 introduced several technical and quality-of-life improvements: Grey Hack Free Download (v0.7.4120)
You can buy the game on the Steam Store , which is the primary legitimate source for downloads and updates. A physical tabletop RPG version named "Greyhack RPG"