1) Unpack the installer file corrosponding to your opertating system: "Installer_Windows.rar" OR "Installer_Mac.rar" 2) Run the exectuable installation file inside the unpacked folder: "IIDAP_Windows_Installer.exe" OR "IIDAP_Mac_Installer.app" NOTE: Internet connection may be required for the installer to download the lastest runtime environement (about 500Mb for the Matlab-based app, IIDAP. 3) If needed, unpack the supporting documents "Supporting document.rar" and the hazard data folder "USGS Hazard Data.rar". 4) Run IIDAP from the installation directory.