Software Key Source
Redeem a voucher

Set up Windows 11 Pro

For 1 PC. Your delivery email has your product key; these are the steps to install and activate.

Before you begin

Checking these first avoids most installation and activation problems.

  • Microsoft’s PC Health Check app says the PC can run Windows 11.
  • Your files are backed up.
  • You know the edition now installed: Settings, System, About.
  • The PC is connected to the internet.

Install and activate

Follow the steps in order.

Keep your product key private. Never post it or send the whole key by email.

  1. Confirm the PC is compatible

    Run Microsoft’s PC Health Check app. Back up your files before changing the operating system.

  2. Check your current edition

    Open Settings, System, About. If the PC already runs Windows 11 Home, the Pro key switches it to Pro. If it runs Windows 10, upgrade to Windows 11 first with the installer from Microsoft’s Windows 11 download page.

  3. Enter your product key

    Go to Settings, System, Activation, choose Change product key and type the key from your email.

  4. Confirm activation

    The Activation page shows Windows 11 Pro as active once the key is accepted. A restart may be needed.

If something goes wrong

The fixes that resolve most cases for this product.

See all problems and fixes
Windows shows an activation error code

The code tells you what Windows rejected:

  1. 0xC004F050: the key does not match the installed edition, or it was mistyped. Check Home against Pro and type it again.
  2. 0xC004C008: the key has already been used for activation on another device.
  3. 0xC004C003: Microsoft’s activation servers refused the key.

Contact support about an activation error

My key is not accepted

Type the key rather than pasting it, and check characters that look alike, such as 8 and B or 0 and D. Make sure the key is for the product and edition installed on the computer.

If it is still refused, email info@softwarekeysource.com with a screenshot of the message and your SKS reference.

I bought the wrong edition

Keys cannot be switched between Windows and Mac, or between Home and Pro. If you have not redeemed the voucher yet, ask Groupon about your options for the order first.

A key that has been delivered is not refunded. If you are unsure which edition your computer needs, email info@softwarekeysource.com before you redeem.

Product details, compatibility and the regular price are on the Windows 11 Pro product page.

Contact support by email

Send your SKS reference, the product and edition, and a screenshot of any error message.

Contact support Open the help center