Let us start from when your PC has factory installed OEM Windows 8. For Windows 8.1 : If you have upgraded from Windows 8 to Windows 8.1, its fine. If you want a clean install, use "Windows 8.1 Update 1" OEM installation media of SIMILAR EDITION as of your original Windows 8, it should accept your Windows 8 key retrieved from BIOS.

If you've Upgraded that Win 8.1 to Win 10, and if this is in the same system.you do not need nor can use your old Win 8.1 license. Simply install Win 10 on the new drive. When it asks for the license key, skip that part and proceed on. It will activate itself when the system goes online later.
If you've lost your Win 7/8 key and you don't have a label or the label is destroyed, you can try using your Internet Explorer key. I've found that the IE key is always the same as your Windows key, but for some reason, upgrading to Windows 10 doesn't change the key over when you pull it with a keyfinder. Edit: for use in the case that you have
To open "Command Prompt" just Right-click the Start button. on the > Left screen corner > select - Command Prompt as ( Admin) a small black Screen appears. Type the command below : After the _ Blinking dash. Wmic Path softwarelicensingservice get OA3xOriginalProductKey : press-Enter.
You must be signed in to Windows with an administrative account in order to open the Command Prompt as an administrator. Type the command to display your product key. To display your product key, type the following command and press Enter . wmic path softwareLicensingService get OA3xOriginalProductKey.

Then we setup the BIOS/UEFI or the boot menu of the laptop from which we want to get the Window 8.1 product key. We boot from the Lazesoft recovery media and select the Lazesoft Live CD or USB option. At the recovery environment, we select the "Find Windows Product Key" option. We confirm that we are using the free version for non-commercial

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how do i find my windows 8.1 license key