Installation from USB Flash Drive This section applies if you have received a USB Flash Drive from a COMSOL representative. starting the installer from a usb flash drive The COMSOL Installer is a user interface tool that guides you through the installation process. To start the installer: 1 Connect the USB Flash Drive to your computer. 2 Launch the COMSOL Installer application from the Finder. 3 The COMSOL 5.2a Installer window appears. Now continue with the instructions in the section Running The COMSOL Installer below.