tomshardware[.]com/software/windows/ditching-windows-10-heres-how-i-installed-windows-11-removed-ai-and-stripped-out-unnecessary-options-using-flyoobe
Les Pounder at Tom's Hardware walks you through the steps upgrading to & setting up Win11 using the free app Flyoobe and an older laptop. Flyoobe's dev has been around for a while, with somewhat erratic efforts with apps to remove Windows bloat etc., but he's going gangbusters with Flyoobe so far, with updated versions almost every day for the last week or so. You don't need Flyoobe to install Win11 on unsupported hardware, but it makes it easier, and the options to skip adding things like Copilot AI mean it might be worthwhile to you upgrading hardware that does meet Win11's requirements.
I upgraded everything before Flyoobe existed, in some cases before Rufus had the option to skip the hardware checks too. The current method [meaning it still works] is to mount the ISO, then run setup using the Run box: "setup.exe /product server" [w/out quotes]