Add to C:\Windows\System32\drivers\etc\hosts:
0.0.0.0 v10.vortex-win.data.microsoft.com
0.0.0.0 oca.telemetry.microsoft.com
0.0.0.0 settings-win.data.microsoft.com
Microsoft does not distribute 21H1 publicly anymore. But if you have a Volume Licensing account or MSDN subscription, you can download the original, unmodified ISO. You still need a valid license. And again, running an EOL OS is not recommended even if genuine.
Unlike a standard ISO downloaded directly from Microsoft, an "MPB Pure" build is a modified Windows image (WIM/ESD). The goal of these modifications is usually performance and privacy. Windows 10 Pro 21H1 19043.1081 x64 MPB Pure Pre...
Common modifications in "Pure" builds include:
In the landscape of custom Windows installations, power users and system enthusiasts often seek streamlined versions of the operating system that cut out the bloat and focus on performance. The Windows 10 Pro 21H1 19043.1081 x64 MPB Pure Pre... refers to a specific, modified release of Windows 10 Professional tailored for speed, stability, and a cleaner user experience. Add to C:\Windows\System32\drivers\etc\hosts : 0
This write-up explores the technical specifications of this build, the significance of the version numbers, and what defines the "MPB Pure" philosophy.
New-Item -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\DataCollection" -Force
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\DataCollection" -Name "AllowTelemetry" -Value 0 -Type DWord
New-Item -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\Windows Search" -Force
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\Windows Search" -Name "AllowCortana" -Value 0 -Type DWord
Downloading and installing pre-activated Windows ISOs violates Microsoft’s Software License Terms. You are effectively using stolen activation mechanisms. Legal consequences can include: Microsoft does not distribute 21H1 publicly anymore
Ethically, using unofficial builds devalues the work of software engineers. Moreover, because these builds often disable telemetry, you miss critical crash data that could help improve genuine Windows ecosystems.
Safe alternatives: