Reboot and press F12 (or your boot menu key) to select the UEFI USB drive (it will say "UEFI: USB Drive Name").
Since Microsoft no longer provides direct downloads, you must rely on archived or third-party sources. Downloading from unofficial sources carries significant security risks, including malware.
Downloading a working is only half the battle. The real challenge lies in preparing the installation media with the right bootloader (EFI), the right partition table (GPT), and the right drivers (USB 3.0 + NVMe). While Microsoft has made this process difficult by design (to push users to Windows 10/11), the DIY enthusiast community has kept Windows 7 alive on modern hardware.
Navigate to \sources\install.wim on the ISO and open it with 7-Zip . Go to \1\Windows\Boot\EFI\bootmgfw.efi .
A valid Windows 7 product key is required for activation after installation.