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Microsoft support may be able to assist in reactivating OEM licenses under specific circumstances, even if the key is lost. You can try chatting with a support agent to explain your situation. How to Activate Windows 8.1 for Free - wikiHow I'd like to provide you with a helpful
Replace <product_key> with a valid Windows 8.1 Pro product key (e.g., VK7JG-NPHTM-C97JM-9MPGT-3V66T). You can search for a valid product key online. How to Activate Windows 8
Several methods can be used to activate Windows 8.1 Pro Build 9600 without a product key. These methods include: These methods include: To activate Windows 8
To activate Windows 8.1 Pro Build 9600 without a new product key, you can typically KMS (Key Management Service) method via the Command Prompt or a script
Microsoft Support: You can contact a support agent directly through Microsoft Support to explain your situation, especially if you have changed hardware recently.