Force the use of a downloaded file - Internet Explorer 9.

When you download an executable file, the installer software for example, Internet Explorer checks if it appears safe notably based on the number of times the file was downloaded. The browser will prompt you to delete the file. If you download from a trusted source and you are certain to want to use the downloaded file, a little manipulation is required.

1- Internet Explorer tells you that the downloaded file can not be sure.

2- Click the Actions button.

3- Click Run and still validate. The installation of your software starts.