When you click on a download link in a browser, IDM will download and accelerate it. IDM supports HTTP, FTP and HTTPS. It is not high cost ($9.99 for single PC), but many people does not have. Internet Download Manager (IDM) is a tool to manage and schedule downloads.
There are two types of ISO files. One is the normal Windows 10 ISO file which contains all consumer-level editions of Windows including Home, Pro, etc. The second type of ISO is the enterprise version of Windows. You can choose the Windows 10 ISO download according to your requirements.