This is the easiest way to install Mystery Case Files: Huntsville. All you need to do is choose "Open" when prompted and then follow the
instructions to install Mystery Case Files: Huntsville to your computer.
Choose this option if your network doesn't allow direct downloading of executable files. Once downloaded, extract the zip file and run
mysterycasefiles.exe, which will install Mystery Case Files: Huntsville to your computer.
If neither of the above options work for you, try these: