Download RUFUS

https://rufus.ie/

You need also a Windows ISO image and a USB key

To upgrade from Windows 10 to Windows 11 using Rufus, download the Rufus utility and a Windows 11 ISO file, then create a bootable USB drive with Rufus. In Rufus, select your USB drive and the Windows 11 ISO, then choose the “Remove requirement for 4GB+ RAM, Secure Boot and TPM 2.0” option during the process to bypass hardware checks. Once the USB is created, you can either run the setup directly from the USB in Windows 10 to perform an in-place upgrade or boot from the USB to do a clean install.

  Download Rufus: Get the latest version of Rufus from its official website.
  Download Windows 11 ISO: Download the Windows 11 disk image (ISO) from the official Microsoft website.
  Insert a USB drive: Plug a USB drive with at least 8GB of storage into your computer. 

  Launch Rufus: Open the Rufus application.
  Select the USB drive: In the "Device" dropdown, choose your USB drive.
  Select the ISO: Click the "Select" button next to the "Boot selection" dropdown and choose the Windows 11 ISO file you downloaded.
  Choose partition scheme: Select the correct "Partition scheme" and "Target system" (typically GPT and UEFI for modern PCs) that match your computer's setup.
  Start the process: Click "Start".
  Modify the installation: A "Windows User Experience" dialog box will appear. Check the box to "Remove requirement for 4GB+ RAM, Secure Boot and TPM 2.0" and make any other desired changes.
  Confirm and create: Click "OK" to accept the changes and then click "Start" again to begin creating the bootable USB drive.
  Wait for completion: Allow Rufus to format the USB drive and copy the necessary files. This process will erase all data on the USB drive, so back up any important files first. 

  Run the setup: With the bootable USB drive plugged in, go to File Explorer in Windows 10, open the USB drive, and run the setup.exe file.
  Follow the prompts: Follow the on-screen instructions, accepting the license agreement. Because Rufus modified the installer, it will proceed with the installation even if your PC doesn't meet the official requirements.
  Choose to keep files: You can choose the option to keep your personal files and apps during the upgrade, similar to a standard Windows update.
  Restart and finish: The computer will restart multiple times. After the final restart, you will be running Windows 11. 

Note: Installing Windows 11 on unsupported hardware may mean you will not receive all future updates from Windows Update, and Microsoft does not officially support this method.