How to Upgrade Windows 10 Home to Pro Using an OEM Key

Before You Upgrade

Take a few minutes to confirm your current Windows edition, activation status, and system condition before starting the upgrade.

Check Your Current Windows Edition

Windows should be running an activated Home edition before you upgrade it to Pro.

1. Open the Start menu.
2. Select Settings.
3. Go to System.
4. Select About.
5. Look under Windows specifications.

The edition should be listed as Windows 10 Home. If the computer is already running Windows 10 Pro, you only need to check its activation status.

You can also press Windows + R, enter winver, and select OK to view the installed Windows edition and version.

Back Up Your Files and Install Updates

An edition upgrade should preserve your files and applications, but creating a backup is still recommended.

• Back up important documents, photos, and work files.
• Connect laptops to a power source.
• Make sure the computer has a stable internet connection.
• Temporarily disconnect unnecessary external devices.
• Install available Windows updates before upgrading.
• Save your Windows 10 Pro product key somewhere secure.

Understand Edition Upgrade and Activation

Changing the Windows edition and activating Windows are related, but they are not the same process.

Windows edition upgrade vs activation

Process	What It Does	What It Requires
Edition upgrade	Installs and enables the Windows 10 Pro feature set.	A supported upgrade path and a product key accepted by Windows.
Activation	Verifies that the installed copy of Windows is properly licensed.	A genuine Windows 10 Pro license or an eligible digital license.

A generic edition-change key can switch Windows to Pro, but it does not provide a license or activate Windows.

How to Upgrade Windows 10 Home to Pro

Follow these steps when you have a genuine Windows 10 Pro OEM or retail product key.

Open the Activation Settings

1. Open the Start menu.
2. Select Settings.
3. Open Update & Security.
4. Select Activation from the sidebar.

Confirm that the installed edition is Windows 10 Home and that Windows is activated before continuing.

You can also press Windows + R, enter slui.exe, and select OK to open the Windows activation interface.

Enter Your Windows 10 Pro Key

1. Under Upgrade your edition of Windows, select Change product key.
2. Enter your 25-character Windows 10 Pro product key.
3. Select Next.
4. Allow Windows to verify the key.
5. Select Start or Activate when prompted.

A Windows product key normally follows this format:

XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

Enter the key exactly as provided and avoid adding spaces before or after it.

Install the Pro Edition

After Windows accepts the upgrade, it will install the additional Windows 10 Pro components. The computer may restart during this process.

• Do not turn off the computer while the upgrade is being installed.
• Keep laptops connected to a power source.
• A temporary black or blue screen may appear during the restart.
• The upgrade can take several minutes depending on the computer.

In most cases, Windows does not need to reinstall your applications or delete your personal files.

Confirm Windows Activation

After the computer restarts:

1. Open Settings.
2. Go to Update & Security.
3. Select Activation.
4. Confirm that the edition is listed as Windows 10 Pro.
5. Confirm that the activation status says Windows is activated.

Do not rely only on the edition name. Windows can be running the Pro edition without being activated, so check both the edition and activation status.

What to Do If the OEM Key Is Rejected

If Windows does not accept your OEM key while the Home edition is installed, the key may only be accepted after Windows has switched to the Pro edition.

Before trying another method, check the following:

• Confirm that the key is for Windows 10 Pro.
• Check every character for typing errors.
• Make sure Windows 10 Home is activated.
• Install pending Windows updates.
• Restart the computer and try the key again.
• Confirm that the key has not already been assigned to another device.
• Check the computer’s date, time, and time zone.

If the key is genuine but cannot initiate the edition change, you can switch the installed edition first and then activate it with the purchased OEM key.

Using the Generic Pro Edition Key

Microsoft provides generic installation keys that can be used to install or switch to a particular Windows edition. These keys do not include a license and cannot permanently activate Windows.

Generic Windows 10 Pro edition-change key:

VK7JG-NPHTM-C97JM-9MPGT-3V66T

This key does not activate Windows. It only tells Windows to install the Pro edition. You must enter your genuine Windows 10 Pro OEM or retail key after the edition upgrade is complete.

Switch to Pro with the Generic Key

1. Open Settings.
2. Go to Update & Security.
3. Select Activation.
4. Select Change product key.
5. Enter VK7JG-NPHTM-C97JM-9MPGT-3V66T.
6. Select Next and start the edition upgrade.
7. Allow the computer to restart.

Activate with Your Genuine Pro Key

After Windows reports that the installed edition is Windows 10 Pro:

1. Return to Settings > Update & Security > Activation.
2. Select Change product key.
3. Enter the genuine Windows 10 Pro key you purchased.
4. Select Next.
5. Select Activate.

If activation succeeds, the Activation page should confirm that Windows is activated with a digital license or product key.

OEM vs Retail Windows Licenses

Before moving a Windows license to another computer, understand the license type you purchased.

Comparison of common Windows license types

License Type	Typical Use	Device Transfer	Activation Notes
OEM	Usually supplied with a new computer or licensed for one specific device.	Generally tied to the first computer on which it is activated, especially its motherboard.	A major hardware change may require troubleshooting or a new license.
Retail	Purchased separately for installation on a compatible computer.	May allow transfer under the applicable license terms after removal from the previous device.	Activation may be linked to the owner’s Microsoft account.
Volume	Used by organizations managing multiple computers.	Controlled by the organization’s licensing agreement.	May use MAK, KMS, or another organization-managed activation method.

License rights can vary according to the product and agreement. Check the terms supplied with your license before transferring it.

Verify the Windows 10 Pro Upgrade

Use the following methods to confirm that the edition upgrade completed successfully.

Check Activation from Command Prompt

Open Command Prompt as an administrator and run:

slmgr /xpr

A dialog should report whether Windows is permanently activated or whether its activation has an expiration date.

You can display more detailed license information with:

slmgr /dlv

Windows 10 Pro Features to Test

After upgrading, check for features that are not normally available in Windows 10 Home.

Fix Common Upgrade and Activation Errors

The Product Key Does Not Match the Edition

A product key can only activate its intended Windows edition. Verify that your key is for Windows 10 Pro and not Home, Enterprise, Education, or another product.

The Key Has Already Been Used

This message may appear when the key is already activated on another computer or has exceeded its permitted number of activations.

If the key is an OEM license, it may be tied to the first device on which it was activated. Contact the seller if the key was advertised as new but appears to have been used previously.

Windows Cannot Reach the Activation Servers

• Check your internet connection.
• Temporarily disable any VPN or proxy.
• Confirm the date, time, and time zone.
• Restart the computer.
• Try activation again later if Microsoft services are temporarily unavailable.

Run the Activation Troubleshooter

1. Open Settings.
2. Go to Update & Security.
3. Select Activation.
4. Select Troubleshoot, if available.
5. Follow the displayed instructions.

If you recently replaced hardware and your digital license was linked to a Microsoft account, the troubleshooter may display an option such as I changed hardware on this device recently.

Record the Complete Error Code

Activation errors often include a code beginning with 0x. Record the full code before contacting support because it can identify whether the problem is related to the edition, product key, hardware, or activation servers.

Find an Embedded Windows OEM Key

Some computers include an OEM product key stored in the device firmware. You can check for an embedded key using PowerShell.

Check with PowerShell

1. Right-click the Start button.
2. Open Windows PowerShell (Admin) or Terminal (Admin).
3. Run the following command:

(Get-CimInstance -ClassName SoftwareLicensingService).OA3xOriginalProductKey

If the computer contains an embedded OEM key, PowerShell may display it. A blank result usually means that no readable key is stored in the firmware.

Legacy WMIC Method

Older Windows installations may also support this Command Prompt command:

wmic path SoftwareLicensingService get OA3xOriginalProductKey

WMIC is deprecated and may not be available on newer Windows installations. The PowerShell method is generally preferable.

An embedded key may belong to the computer’s original Home edition. Finding a firmware key does not guarantee that it is a Windows 10 Pro key.

Frequently Asked Questions

Conclusion

You can upgrade an activated Windows 10 Home installation to Windows 10 Pro without performing a clean installation. Open the Activation settings, enter a genuine Pro key, allow Windows to install the additional features, and verify both the edition and activation status afterward.

If an OEM key cannot initiate the upgrade, the public generic Pro key can be used to change the installed edition. It does not activate Windows, so the genuine purchased key must be entered after the edition switch.

Because Windows 10 reached the end of regular support on October 14, 2025, computers that meet the requirements should be moved to Windows 11 whenever practical.