@Forseti, The app is made with Inno as both niTe_RiDeR_Pro and Escorpiom have confirmed. Just because you are not able to unpack an installer to satisfy your curiosity as to how it works does not make an app a security risk nor does it make it a "bad installer".. There are many apps, both free, like this one, and commercial whose developers have chosen to prevent the apps from being unpacked, and those developers are within their rights to do so and they do not have to justify their decision. As Escorpiom has also mentioned, we are aware that the IDM installers that niTe_RiDeR_Pro is working on in his free time to provide for all of the members here at WinCert for their convenience have some issues which niTe_RiDeR_Pro is working on to resolve. If you have some specific issues that this installer is causing and you have some suggestions on how to fix those issues, or you have some specific requests on how the app can be improved, then by all means please help by politely posting those here and explain your reasoning for the benefit of all of our readers. If your only reason for posting is that you do not want to install any app that you are not able to unpack, then you have made your point and you do not need to post again. Thanks in advance for your cooperation. Cheers and Regards