For that reason, we recommend that you sign up for the Apple Beta Software Program here and proceed to register an Apple device so you can get access to download the OS profile and Big Sur Install app. Of course, there are several third-party sources that are now offering the macOS Big Sur beta version as DMG but not all of them are trustworthy. Let's briefly look at how to download macOS Big Sur DMG file. Although there are some tricks to install macOS Big Sur on unsupported Macs, it is not recommended doing so as it may brick your Mac.
