This quick guide will help you download, install, and activate Microsoft Office 2021 Professional Plus on your Windows PC.
What You Need Before Starting
Make sure you have:
- A valid Office 2021 Professional Plus key
- A Windows 10 or Windows 11 PC
- An internet connection
- Access to a Microsoft Account (free)
That’s all – you’re ready!
Step 1 – Download Office 2021
Option A – Download from Microsoft (Recommended)
- Go to https://setup.office.com/
- Sign in with your Microsoft Account.
- Enter your Office 2021 product key.
- Choose your language.
- Click Download.
Your Office installer (.exe file) will now download to your Downloads folder.
Option B – Download the Official ISO (Alternative)
If the Microsoft setup page doesn’t work or you prefer an ISO file, you can use the official Microsoft download links.
Step 2 – Install Office 2021
- Open the downloaded file: Setup.exe
- If Windows asks: “Do you want to allow this app to make changes?” – Click Yes.
- The installation will begin automatically.
- Wait until you see the message:
“You’re all set! Office is installed now.” - Click Close.
That’s it – Office is installed on your PC!
Step 3 – Activate Office 2021
Automatic Activation
- Open Word, Excel, or any Office app.
- If asked, sign in with the same Microsoft Account you used earlier.
- Office will activate automatically.
Enter the Key Manually (if prompted)
If the activation window appears:
- Click Enter Product Key.
- Type your 25-character Office key.
- Click Activate.
How to Check if Activation Worked
- Open any Office app (e.g., Word).
- Go to File > Account.
- Look for Product Activated under Product Information.
If you see “Activated”, you’re done!
Need Help? Troubleshooting & Support
If you have any concerns or require technical support, don’t hesitate to reach out via our live chat at https://keylify.com/ or email [email protected]. We’re available 24/7 to help.