We have given up on attempting to satisfy all the complex and ever-changing Windows security requirements, so Windows will issue a warning when you install Bendyroad software.
Most browsers do not allow double-clicking on a downloaded file. You have to navigate to the location where downloaded files are stored, and then double-click on it.
Once you start the installer package, Windows Defender shows up with a warning.
Click on [More info]. The name and version of the package are displayed as: brainbuilder-[version].msi.
Click on [Run anyway]. The installer will start.