Flyoobe is a free, MIT-licensed Windows setup tool from developer Belim (GitHub: builtbybel). It began as Flyby11, a small helper that let Windows 10 PCs start a Windows 11 upgrade when setup rejected their hardware. Version 3, released in September 2026, rebuilt it as what the developer calls a “Windows setup companion.” It reviews your Windows settings against editable rule files, installs apps through winget, removes preinstalled apps after you confirm, and saves your choices as reusable “recipes.” It still includes the Flyby11 upgrade path for Windows 10 PCs that don’t meet every Windows 11 requirement.
When to use Flyoobe
- After a fresh Windows install, to review and change settings in one place instead of hunting through Settings.
- To apply the same setup to several PCs using a saved recipe.
- To start a Windows 10 to Windows 11 upgrade on hardware that fails Microsoft’s checks, if you accept that Microsoft does not support Windows 11 on that hardware. See our unsupported-PC guide.
When not to use it
- On a PC you can’t afford to troubleshoot. It changes system settings and registry values. Turn on its optional change log first so you have a record.
- If you need auditable source code. The developer says the refactored 3.x source is not published yet. The repository currently holds the previous generation.
- If your processor lacks PopCnt or SSE4.2. No tool can get Windows 11 24H2 or later past that requirement.
Requirements
Windows 10 or Windows 11 with .NET Framework 4.8. Flyoobe ships as a ZIP. Extract it and run Flyoobe.exe. The optional Setup Actions, which are PowerShell scripts, come in a separate Actions.zip and are off by default.
Verify your download
Download only from github.com/builtbybel/Flyoobe/releases. The developer warns that flyoobe.com and the GitHub account github.com/flyoobe are not affiliated with the project. The executable is not code-signed, so compare the SHA-256 below with Get-FileHash .\FlyoobeApp.zip. Full walkthrough: Is Flyoobe safe?
Questions
Is Flyoobe the same as Flyby11?
Same developer and same repository. Flyby11 was the original upgrade helper, and Flyoobe grew out of it. Flyoobe 2.4 and “Flyby11 Classic” are still linked from the README but are no longer developed.
Why did Microsoft Defender flag it?
In February 2025 Defender flagged Flyby11 1.2 as a potentially unwanted application (PUA:Win32/Patcher). Microsoft says PUA is not a virus category. Treat any alert on a file from a lookalike site as real.
Does Flyoobe run PowerShell scripts?
Only the optional Setup Actions, which are disabled by default. The developer advises reading each action before running it.
Is there a winget package?
Not as of September 26, 2026. Download from GitHub releases.
