With the October 14, 2025 end-of-support deadline for Windows 10 fast approaching, millions of PC owners face a stark choice: buy a new computer or stick with an unsupported operating system. Microsoft’s official stance has been clear—if your machine lacks a TPM 2.0 chip, Secure Boot, or an approved CPU, Windows 11 won't install. But a wave of nearly 400 reader reports gathered by ZDNET tells a different story. Using two simple, community-verified workarounds, users have successfully upgraded PCs from 2018 and earlier, saving thousands of dollars and keeping perfectly functional hardware out of landfills.
The Two Bypass Methods: Registry and Rufus
The first method relies on a single registry edit documented—but not loudly promoted—by Microsoft. When a PC satisfies all Windows 11 requirements except the CPU, you can add a DWORD value named AllowUpgradesWithUnsupportedTPMOrCPU under HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup and set it to 1. This tells the Setup program lifted from an ISO to bypass CPU checks and accept a TPM as low as version 1.2. The method is meant for in-place upgrades that keep apps, settings, and files intact, but Microsoft explicitly warns the device “won’t be entitled to receive updates” and is not recommended.
The second method is for machines that fail multiple checks—no TPM 2.0, legacy BIOS instead of UEFI Secure Boot, or insufficient RAM. The free Rufus utility can create a bootable USB drive with an “extended” Windows 11 installation mode that disables TPM, Secure Boot, RAM, and even Microsoft-account requirements during setup. You boot from the USB stick to run a clean install or, in some cases, an in-place upgrade. Rufus’s own documentation notes that the bypass applies only when booting from the media; running Setup.exe from within Windows won’t inherit the bypass.
What the Data Shows: Nearly 400 Real-World Upgrades
ZDNET’s Ed Bott solicited experiences from readers who used his guide, and the response was overwhelming. The majority reported straightforward upgrades with few complications. “Worked flawlessly,” said one owner of a 2018 laptop. A refurbisher wrote of upgrading multiple machines before donating them. A small percentage hit installer errors, but most were resolved by correcting a registry typo or re-downloading a corrupted ISO. Several upgraders confirmed that monthly security updates continued to arrive after the upgrade, though feature updates sometimes required manual intervention.
The reports paint a consistent picture: the hardware blocks are surmountable for a wide range of devices, even those Microsoft’s official tool declares incompatible. These aren’t hobbyist tinkerers alone; many described themselves as non-technical users who simply followed step-by-step instructions.
Microsoft’s Official Position vs. Reality
Microsoft’s support pages repeatedly emphasize that installing Windows 11 on unsupported hardware is “not recommended” and that such PCs “might not receive updates, including security updates.” The company has never publicly backed away from this warning. Yet the evidence from ZDNET’s readers shows that, as of now, security patches are still flowing to these machines. This aligns with what enterprise customers experienced when Microsoft itself encouraged similar bypasses for testing. Still, the policy is a time bomb: Microsoft could change enforcement at any moment, and the legal and practical risks are real. If an update is ever withheld, users may need to manually install future patches or accept a growing security gap.
The Risks You Need to Know
Beyond the update uncertainty, several risks loom:
- Driver and feature gaps: Older chipsets may lack Windows 11 drivers, leading to missing functionality or degraded performance. Virtualization-based security features like HVCI may not work or could slow down the system.
- Warranty voiding: Microsoft warns that damage from installing on unsupported hardware might not be covered by manufacturer warranties. For devices still under warranty, this is a significant consideration.
- Future fragility: A future Windows update could deliberately or accidentally block these bypasses, forcing users to re‑apply workarounds or revert to Windows 10.
- Spectre/Meltdown speculation: Many industry watchers suspect the strict CPU list is a reaction to the 2018 Spectre and Meltdown vulnerabilities. The mitigations for those flaws cut performance on older processors, and skipping those CPUs sidesteps the issue. Microsoft has never confirmed this link, but the timing is suggestive. Treat it as plausible but unverified.
How to Safely Upgrade Your Old PC (If You Choose To)
If you accept the risks and want to proceed, follow this tested sequence:
- Back up everything with a full system image tool. If anything goes wrong, you need a path back.
- Identify your blockers using Microsoft’s PC Health Check app. Note whether the failure is CPU, TPM, Secure Boot, or something else.
- Choose your method:
- If the CPU is the only issue and you have at least TPM 1.2, use the registry edit, mount the official Windows 11 ISO, and run Setup.exe from within Windows 10.
- If TPM is missing, Secure Boot is off, or you’re on legacy BIOS, create a Rufus USB with the extended installation mode, boot from it, and run the installer. - Be patient: Older hardware may take longer. If the installer fails with a vague error, re‑download the ISO and recreate the media—many resolved failures this way.
- Check Windows Update after installation and over the following weeks. Record your build number and update history in case something changes later.
Who Should—and Shouldn’t—Try This
These workarounds are best suited for hobbyists, refurbishers, small-scale upgraders, and technically comfortable home users who can tolerate some risk and handle occasional troubleshooting. They’re a powerful way to extend the life of functional hardware and avoid unnecessary e‑waste.
They are not recommended for enterprise production systems, devices under active manufacturer warranty where support denial would be unacceptable, or machines handling sensitive workloads that demand guaranteed, timely security patches. For those scenarios, a new, officially supported PC or the paid Extended Security Updates for Windows 10 are safer bets.
The Bottom Line
The community-driven proof is undeniable: Windows 11 can run on many machines Microsoft’s installer rejects, and for now, they receive security updates. However, “works today” does not equal “supported forever.” The two bypass methods are practical, accessible, and have been validated at scale, but they come with clear trade-offs. If you proceed, do so with open eyes: back up, verify, and stay prepared to manage the device yourself if Microsoft or OEMs shift gears. For a large swath of users, the gains—cost savings, extended hardware life, and a current OS—outweigh the risks, but the final call rests on your own tolerance for uncertainty.