How to Install and Activate Office 2021 Professional Plus

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ousama baghalm

On May 25, 2026

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Pre-Installation Checklist

Office 2021 Professional Plus is an enterprise-grade suite. For a smooth installation, you must ensure your PC is prepared.

⚠️ Mandatory Step: Go to Control Panel > Programs and Features and completely uninstall any previous versions of Microsoft Office or Microsoft 365 trial versions. Restart your PC after uninstalling before proceeding to Step 1.

Step 1: Download & Mount the Installer

Download the official Office 2021 Pro Plus setup file using the secure download link provided in your Sorted Keys delivery email.
Once downloaded, double-click the .img or .iso file to mount it to your system as a virtual DVD drive.
Open the newly mounted drive in File Explorer and double-click the Setup.exe file.

[Insert Image: The official Microsoft Office 2021 box art or logo]

Step 2: Installation and Activation

The Microsoft Office installer will launch. Wait for the installation progress bar to finish.
Once installed, open any Office application from your Start Menu (like Microsoft Word).
A prompt will appear asking you to activate the software. Enter the 25-character product key provided by Sorted Keys.
Select “Activate software over the internet” and click Next to finalize your deployment.

✅ Deployment Complete: Your Office 2021 Professional Plus suite is now permanently activated on your machine.