The IGEL OS Creator for Windows (OSCW) is able to convert Windows machines to IGEL OS 11, provided that they fulfill the hardware requirements.
Choose the instructions according to your needs:
On secured-core PCs (see e.g. https://www.microsoft.com/en-us/windows/business/devices?col=secured-core-pcs), it is necessary to change the UEFI boot settings to „Microsoft 3rd-Party UEFI CA“ in order to start the IGEL OS. It is required since by default, the UEFI only trusts Microsoft's 1st-party signing key for Windows, not the 3rd-party signing key that Microsoft uses to sign the IGEL OS.