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Look for the best Windows 10 to Windows 11 upgrade tool
Windows 11 Installation Assistant. It is Microsoft's own free, official upgrade tool — a small executable (around 4 MB) you download directly from Microsoft's website and run on your Windows 10 PC. It's essentially the simplest, most direct path to Windows 11 for eligible hardware.
Download: https://www.microsoft.com/en-us/download/details.aspx?id=108398
Why it's a good Windows 10 to Windows 11 upgrade tool
It's an in-place upgrade — by default it preserves your files, apps, and most settings, and gives you an option to confirm what to keep before installing. TechSpot
No bootable media needed — unlike the Media Creation Tool, you don't have to create a USB drive or ISO; it's Microsoft's official tool for upgrading Windows 10 to Windows 11 that works more like using Windows Update.
Built-in compatibility checking — it checks basic compatibility like Windows 10 version and free disk space, and for deeper checks like TPM and Secure Boot, it prompts you to run the PC Health Check app, after which you can click Refresh in the Assistant to get updated feedback.
It's fully supported — since it comes straight from Microsoft, your upgraded PC keeps receiving updates normally, unlike bypass methods.
Also useful for repairs — users already on the latest Windows 11 version can use the Installation Assistant as a repair tool, since reinstalling through it can resolve issues like corrupted system files while preserving data.