How to purchase a WIN11 PRO license, already accidentally ordered WIN10PRO to WIN11PRO but had no product key

Request cancellation or a billing-assisted refund for the mistaken upgrade purchase, then activate the installed Windows 11 Pro with an existing transferable Windows 10 Pro license or purchase a new full license only if that license cannot transfer.

1. Request cancellation, exchange, or refund

Microsoft Learn Q&A cannot access orders or process exchanges.

1. Sign in to your Microsoft account Order history and locate the mistaken purchase.
2. If Cancel item appears, select it and confirm the cancellation. Microsoft documents that this option is available before the order has been charged or fulfilled.^1^
3. If Cancel item, Request a return, or an exchange option is unavailable, contact Microsoft Store support.^2^
   • Alternatively, open Start, search for Get Help, and open it.
   • Enter Billing.
   • Select Contact support.
   • Choose Windows and the available purchase/billing category.
4. Provide the order number and explain that:
   • The purchase was accidental.
   • It has not been redeemed or used.
   • You intended to obtain a license suitable for the newly built or substantially changed PC.
   • You are requesting a refund or exchange toward the correct Windows 11 Pro license.

Approval is determined by Microsoft billing support and the applicable terms; it cannot be guaranteed.

2. Check whether another purchase is necessary

Because Windows 11 Pro is already installed after a hardware change, an existing transferable Windows 10 Pro license may activate the same Pro edition.

To identify the old license channel:

1. Right-click Start and select Terminal (Admin).
2. Run:

slmgr /dli

3. Check whether the displayed channel is Retail or OEM.

If it is Retail, or the old digital license was linked to the same Microsoft account:

1. Open Settings > System > Activation.
2. Select Troubleshoot.
3. Select I changed hardware on this device recently.
4. Sign in with the Microsoft account linked to the previous license.
5. Select the previous device and complete reactivation.

If you still have the old 25-character Windows 10 Pro retail key, open Settings > System > Activation > Change product key and enter it. A Windows 10 Pro retail license can be used to activate Windows 11 Pro of the same edition; an OEM license is generally tied to the original motherboard and cannot be transferred.^3^

3. Purchase the correct license if the old one cannot transfer

If the old license is OEM or reactivation is unavailable:

1. Open Settings > System > Activation.
2. Select Go to Store or Open Store.
3. Purchase the Windows 11 license offered for that PC.
4. Sign in using the Microsoft account that should own the license.

A Microsoft Store app purchase generally activates through a digital license, so it might not provide a visible 25-character key. The license is associated with the hardware and Microsoft account.^4^

If a physical 25-character key is specifically required, purchase a boxed copy from an authorized retailer or a digital copy whose retailer explicitly supplies the key in its confirmation email or digital locker. Microsoft’s product-key guidance distinguishes these purchases from an in-app Pro upgrade, which normally provides a digital license instead.^5^

References

1. Cancel an order or pre-order from Microsoft Store | Microsoft Support
2. Contact Microsoft customer support
3. windows 10 pro to windows 11 pro new parts - Microsoft Q&A
4. [Windows 11](https://support.microsoft.com/windows/activation/activate-windows#for-windows-11,-what-windows-activation-method-do-i-use,-a-digital-license-or-a-product-key)
5. Find your Windows product key | Microsoft Support