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Windows 11 Pro ISO download: how to use the installation file

An ISO file is the complete installation package for Windows 11 Pro, ideal for a clean reinstall. Downloading the ISO is only the first step. Here we explain how to turn the ISO into installable media and how the licence fits in.

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Download and install Windows 11 Pro as an ISO: where the ISO comes from, how to create a bootable USB stick and how the licence fits in.

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From the ISO to the finished installation

  • Download the ISO. The official ISO is available free of charge directly from Microsoft. If you purchase through us, you will also find the matching, Microsoft-signed ISO in our download library.
  • Make the USB stick bootable. Use a tool such as the Microsoft Media Creation Tool or Rufus to write the ISO to a USB stick with at least 8 GB.
  • Install from the stick. Boot the PC from the USB stick and reinstall Windows 11 Pro from scratch or upgrade the existing system.
  • Activate with the key. Enter the licence key during or after the installation. If you run into problems, our support team is here to help.

Why the ISO and the licence belong together

The ISO file installs Windows 11 Pro, but it does not yet make it an activated system. Only the licence key unlocks the full functionality and confirms to Microsoft that the installation is legitimate.

When you purchase through Keywi24, you get both perfectly matched: access to the matching, Microsoft-signed ISO and the 25-character original key. This way you avoid using an incorrect or altered ISO from an unknown source.

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Where do I get the Windows 11 Pro ISO?

You can download the official ISO free of charge directly from Microsoft (microsoft.com/de-de/software-download/windows11). When you purchase through us, the matching, Microsoft-signed ISO is also available in our download library, matched to your license.

How do I install Windows 11 Pro from an ISO?

Write the ISO to a bootable USB stick, start the PC from it and install Windows. Then activate it with the license key.

Is the ISO alone enough for an activated Windows?

No. The ISO installs Windows 11 Pro; for activation and full functionality you also need a valid license key.
About Keywi24

Keywi24 is a Swiss online shop for verified pre-owned Microsoft and antivirus software licences. The team has in-depth market knowledge from over five years of experience. Our goal is not to become the largest licence shop, but the most trusted.

That’s why we don’t invest in marketing hype, but in 90 days of real technical support after every purchase. Legal basis: CJEU ruling C-128/11 (03.07.2012) and Art. 12 para. 2 URG.

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