On PC, Kselebox is generally a paid title. While there may be occasional sales, it is not officially "free-to-play" on Steam like it is on mobile. Safety and Avoiding "Fake" Downloads
Once you've downloaded the game, here is a quick overview of what you can do: Kselebox Free Download
Sites offering "Kselebox Mod APK" or "Free PC Download" often bundle the game with spyware or viruses. On PC, Kselebox is generally a paid title