All Office, Visio and Project products are stored as Zip archives. For unpacking some operating systems you need a software, which you can download here: 7-zip Download .
After unpacking, you will find the setup file for the installation at the bottom of the folder and double-click to listen to it.
For the installation of Windows 7 we recommend the Windows 7 USB Tool or for Windows 10 the Media Creation Tool, which helps you to make your USB stick bootable and to install the ISO file of Windows 10 or Server 2012. This tool is simple and self-explanatory.
When the USB flash drive is finished, you can boot from it. It may be necessary to change the boot order of the PC or laptop.
Here is a tutorial for this process: Create bootable Windows 10 USB stick