developer.microsoft[.]com/en-us/windows/downloads/virtual-machines/
The 20GB download is available for VMWare, Hyper-V, VirtualBox, & Parallels VM hosts. The V/Box version is a .zip file containing an OVA -- import that into V/Box for a ready to run VM. Default hardware settings, FWIW, include Legacy boot rather than the UEFI Win11 requires, but then V/Box does not yet meet the Secure Boot or TPM requirements either. Defaults also include 4 CPU cores & 4GB RAM. There is no sign-in -- fire it up & you go straight to the desktop. It's an evaluation copy that expires 1/9/22 -- presumably there will be another VM available by that time with a later expiration. While a bit over a month seems short, the Microsoft page hints that this one was 1st available 10/9/21.
From the linked site:
This evaluation virtual machine includes:Window 11 Enterprise (evaluation)
Windows 10 SDK, version 2004 (10.0.19041.0)
Visual Studio 2019 (latest as of 10/09/21) with the UWP, .NET desktop, and Azure workflows enabled and also includes the Windows Template Studio extension
Visual Studio Code (latest as of 10/09/21)
Windows Subsystem for Linux enabled with Ubuntu installed
Developer mode enabled
Windows Terminal installed