If you already bought a product key from an authorized retailer (like Amazon, Best Buy, or a Microsoft partner), activation takes seconds. Go to , type your 25-character key (format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX), and click Next. Windows verifies the key online and activates immediately. This method works for retail, OEM, or volume license keys.
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Your edition of Windows doesn't match the key. If you have Windows 10 Home installed but bought a Pro key, it will fail. If you already bought a product key from
If you purchased a physical copy or a digital version from a retailer, you likely have a 25-character code (formatted as XXXXX-XXXXX-XXXXX-XXXXX-XXXXX). Microsoft Support Access Settings : Click the Start button, then go to Update & Security Activation Change product key : Type in your 25-digit code and click to activate over the internet. 2. Digital License (Automatic Activation) This method works for retail, OEM, or volume license keys