If you're using Mozilla Firefox, click the Display the progress of ongoing downloads icon next to Home button and press the X option. For Chrome, press Ctrl+J key combination and click the Cancel button below BMDemo-installer.exe. In Internet Explorer, you need to select the View Downloads option from the Tools menu and to click the Cancel button next to BMDemo-installer.exe below the Actions tab.
If you're using a download manager, press the Close/Stop option associated with BMDemo-installer.exe.