The Unity program (or plugin) allows your browser to access resources on your computer to run the game Krosmaster Arena. This program only has restricted access to your computer: it can't access your folders or files.
Once the program is downloaded, start the installation by double-clicking on it.
Once the installation has been completed, start the game Krosmaster.
The browser is alerted to Unity's presence. An icon will appear in the URL bar to indicate that the plugin has been blocked. You must click on this icon and authorize Unity's execution