SerpApi.Org
When it was first introduced five years ago, Windows 11 brought a lot of new system requirements that left behind a lot of older systems. But despite the outrage caused by Microsoft's official stance, it soon became apparent that it's actually possible to install Windows 11 on these "unsupported" machines using a tool like Rufus. This remained true for a long time.
More recently, however, Microsoft started introducing new blocks for older systems, and this time, there's no getting around it. Windows 11 simply will not run on CPUs that don't support specific instructions, and it could set a bad precedent for future updates.
System requirements used to be lax
You could work around them
The initial requirements for running Windows 11 seemed unnecessarily strict, dropping support for processors that were only a few years old at the time, as well as requiring a TPM 2.0 module, which many desktop PCs didn't have, even if they were relatively recent.
But all of those restrictions were really based on checks performed by the installer once it was already running. Microsoft itself allowed some workarounds to an extent, so if you created an ISO and booted from it, you could bypass certain requirements compared to using the official upgrade paths. Other requirements were checked even if you were booting from a USB drive, but again, only once the installer was running, and the Windows kernel was loaded.
This meant that all you needed was a program like Rufus, which modifies the installer files to remove those checks. The modified installer would boot up as usual, and just ignore any restrictions based on the arbitrary requirements Microsoft put out, so you could use Windows 11 just fine. It's possible you'd miss out on future updates, but you could always use the same workaround if you wanted a newer version.
Microsoft found a more effective block
But only for very old PCs
In 2024, things changed when Windows 11 version 24H2 introduced a new block based on CPU instructions. With this update, Windows 11 required support for the PopCnt (short for "population count") instruction, part of the SSE4.2 instruction set, and it wasn't just a check run by the installer.
The instruction was required for the Windows kernel itself to run at all, which included the USB installer. You can use Rufus to create bootable media, but when you try to boot from the USB drive, you'd see no more than a black screen telling you the OS can't run.
It's not as bad as it sounds, though, because the SSE4.2 instruction set has been commonly supported for many years at this point. SSE4 was first introduced back in 2007, so any PC that doesn't support this instruction set would be largely unusable on Windows 11 anyway.
It sets a precedent
What other blocks will come?
This particular CPU instruction set may not make much of a difference to the vast majority of people, but it sets a concerning precedent. Microsoft has now dipped its toes in blocking devices in such a way that even advanced users can't circumvent it, and this could open the door for more restrictions in the future, potentially barring perfectly usable hardware from newer updates.
It's easy to forget, but new generations of processors aren't always just "the same, but faster". There could be fundamental evolutions in the underlying technologies supported that enable new capabilities, and once specific features become standardized on new hardware, it can be easy for companies to decide old hardware is ready to be thrown out.
Without any known workarounds, Microsoft has the power to determine how long your hardware can be relevant and secure. Unless you're okay with switching to Linux, your computer may stop getting updates and start pushing you to buy a new computer so you can keep doing what you've always been doing. More computers sold means more Windows licenses, which is obviously a big financial incentive for the company as well as its hardware partners.
Whether this will happen or not is more of a "when" rather than an "if". It's certainly possible that Microsoft will hold out for a long time to avoid inconveniencing Windows users, but the company could just as well be tempted to bring Windows PC sales up. After all, you could argue that was the big motivator behind Windows 11's initial system requirements in the first place.
We're safe, for now
It's been a couple of years since Microsoft introduced the PopCnt instruction requirement, and since then, it hasn't introduced new requirements of the same kind, nor are there any signs of it happening in Insider builds. For now, it looks like hardware that's supported today should remain supported for the foreseeable future. But a dangerous precedent has been set, so there's a looming sense of dread knowing that any update could be the one that renders your PC outdated.
