HP Windows 8.1 Pro 64bit Multilanguage OEM DVD Setup Freel
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if your os is corrupted, you could have use windows 10 setup ISO on a usb and repaired it by using DISM command from the command prompt and targeted C: by using the install.wim as your source to fix it .
I have used the mediacreationtool to download windows 8.1 update iso 64bit and it worked with a oem dell key . -microsoft-windows-and-office/download-microsoft-windows/download-windows-8-1-retail-and-oem-iso/
If your intent is to test the first step I advise setting up a virtual machine using VMWare player, you can disable the Ethernet connection in hardware and input the product key. See the video of the setup of Windows 10 for details which is more or less identical: -of-windows-and-linux-on-a-virtual-machine-using-vmware-player/The Windows 10 test preview .iso never asked for a product key but the Windows 8.1 .iso asks for the product key before the setup screen (about 2:11 in the video). 2b1af7f3a8