Among them, the Windows 11 installation assistant can only be used to upgrade the current operating system, and cannot download the Windows 11 installation ISO file. The three upgrade methods are Windows 11 Installation assistant, Microsoft Media Creation Tool (MediaCreationToolW11.exe) and Windows 11 installation ISO file. Microsoft has not yet pushed Windows 11 upgrades to Windows 10 users, but Microsoft officially provides three methods to upgrade to Windows 11 for free, so users need to upgrade Windows 10 to Windows 11 by themselves. Microsoft states that Windows 10 users can upgrade to Windows 11 for free, but the computer to be upgraded needs to meet the Windows 11 system requirements. Octois another important milestone for the Windows operating system, because Microsoft officially released the latest generation of Windows operating system Windows 11 on this day. Method 4: Download Windows 11 installation ISO with Hasleo Windows ISO Downloader.Method 3: Download Windows 11 installation ISO with Hasleo WinToUSB.Method 2: Download Windows 11 installation ISO with Microsoft Media Creation Tool.Method 1: Download Windows 11 installation ISO directly from Microsoft's official website.This tutorial will show you four methods to download Windows 11 Installation ISO file, mainly including the following aspects: