The Windows 7 USB/DVD Download Tool is an application provided by Microsoft for the purpose of creating your own bootable media with which to install Windows 7. Using this tool and a downloaded ISO of Windows 7, you can create USB or DVD installation media which can then be used to setup Windows 7.
The download tool is provided free by Microsoft, however it should be noted that the tool alone is not enough to create installation media. You will also need to download a Windows 7 ISO, and you will then need a valid Windows 7 license to activate the OS once it is installed.
The process of setting up your USB or DVD installation media is exclusively a Windows process, meaning you'll need to be in Windows to do it. Once set up, the Windows 7 installation process can be initiated either from within Windows, or on boot up using the media as a bootable.
Once the tool has been downloaded you will need to download a Windows 7 installation ISO—an image of the installation disc itself. When you run the program, you can choose to use a DVD or a USB drive as your installation media. Then simply wait for the process to finish.
Yes. The purpose of the Windows 7 USB/Download tool is to create Windows 7 installation media. Once created, that media can be used like any regular Windows 7 installation disc. This means that the resultant installation media, be it DVD or USB, can be booted from in order to run the Windows 7 setup.
The download tool for Windows 7 (and Windows 8) is designed to work with older versions of the Windows operating system that have been superseded by Windows 10, and the last stable release of the tool was 2009. Though it is no longer supported, it's specific use case means it doesn't need much support.
The Windows 7 USB/DVD download tool is software for creating Windows 7 installation media, the tool itself cannot upgrade Windows. However, once the installation media is created, that media can be used to upgrade Windows, provided you have the right Windows installation ISO, and a valid license for the upgraded Windows version.
The Windows 7 USB/DVD download tool is a Windows only application, and as such, will not work on Mac OS platforms. Modern Mac computers can run Windows using Boot Camp, however, so it is possible to use the tool in Windows on a Mac machine if this is already set up.
The Windows 7 USB/DVD download tool itself is only a few megabytes in size, and will download fairly quickly on most modern Internet connections. However, to create Windows installation media, you will need a DVD or USB drive with 4GB of space. This will obviously take much more time to download.
The Windows 7 USB/DVD download tool itself is perfectly safe, though you should exercise caution when downloading from untrusted sources. And always download your Windows 7 ISO files from Microsoft directly, however, as many maliciously altered versions of Windows 7 exist, and accidentally installing one on your system could put you at risk.