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I have Lenovo ThinkPad S540 which is already installed Windows 7. But the laptop does not have a DVD player. So I cant install windows 8 using the given CD pack. But when I download Windows 8 updater it either asks me to buy it online or for a product key ( which is not available printed any where).

How can I install Windows 8 in this setup?

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    Get an external USB DVD drive, or copy the DVD onto a bootable USB stick via another computer that has a DVD drive. Mar 27, 2014 at 21:44
  • Use a USB DVD player. Create an ISO on another computer and create your own bootable USB drive. Download an ISO yourself and make a USB drive. If this is an upgrade license not a system builder disk you can use the installer on windows.com to download and create the USB drive
    – Ramhound
    Mar 27, 2014 at 21:45

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  1. Create a bootable USB stick. You can also use other available methods
  2. Copy the DVD content onto the USB
  3. During Windows start up, press F12 (or follow on screen instructions) to get the Boot device dialog
  4. Select USB in the list
  5. The process should be the same as when using the original DVD

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