If not, click 'Download The Installation Files of VirtualBox.' Portable-VirtualBox will show you the download's progress. If you have already downloaded the installer for VirtualBox from click search and navigate to the file.Go to the folder and run Portable-VirtualBox.exe.Download and run Portable-VirtualBox_v5.1.22-Starter_v6.4.10-Win_all.exe.Portable-VirtualBox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation.