If you want to install Windows 10, you’ll need to download the ISO file. Windows 10 ISO images are available for download. Once the ISO file is downloaded, you can use it to create a bootable USB drive or DVD to install Windows 10 on a new computer. To create a bootable USB drive, you can use Rufus or Media Creation Tool.
The ISO size may vary from 3.5 GB to 5.5 GB. The file size will vary depending on the version of Windows 10 you are downloading.