Why do I receive a message about an unidentified developer?

While installing or uninstalling a driver or control panel under OS X 10.8 (Mountain Lion) or OS X 10.9 (Mavericks) you might receive a message like the following, preventing you from completing the installation or uninstallation:

This message is from the OS X Gatekeeper, an function to provide extra security. This type of message could appear under OS X for virtually any downloaded software that is not from the Mac App Store. However, as you have just downloaded the utility from our website (as indicated in the message itself via the download.esi-audio.com reference), you can safely bypass this. This article explains how you can do this:

Instead of double clicking on the icon of what you have downloaded, you right click (with your mouse) on it - or you hold the ctrl-key of your keyboard while you click. Then a context menu will open and in this menu select Open. Now you will see a slightly different popup message like the following:

As you can see, there is now another Open button, which you need to click in order to proceed.

Please note that you could also permanently change this setting (so that a normal double click will always work) in the System Preferences under Security & Privacy > General > Allow applications downloaded from: - but we do not recommend this.