Microsoft Office 2021 Professional Plus – Download, Install & Activation Guide

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On August 21, 2025

Microsoft Office has been the backbone of productivity tools for decades. With Microsoft Office 2021 Professional Plus, users get the perfect mix of reliability, advanced features, and a one-time purchase license without the recurring costs of Microsoft 365.

Whether you’re a student, professional, or business owner, Office 2021 Pro Plus gives you everything you need—Word, Excel, PowerPoint, Outlook, Access, Publisher, and more. In this detailed guide, we’ll walk you through how to download, install, and activate Microsoft Office 2021 Pro Plus on your PC.

Why Choose Microsoft Office 2021 Professional Plus?

✅ One-Time Purchase – No monthly or yearly subscriptions.
✅ Lifetime License – Pay once and own it forever.
✅ All-in-One Suite – Word, Excel, PowerPoint, Outlook, Access, Publisher, Teams (basic).
✅ Enhanced Features – Co-authoring, modern Excel functions, better PowerPoint animations.
✅ Business-Ready – Perfect for offices, freelancers, and students.

System Requirements for Office 2021 Pro Plus

Before you begin, ensure your PC meets the requirements:

Operating System: Windows 10 / Windows 11
Processor: 1.6 GHz or faster, 2-core processor
Memory: 4 GB RAM (64-bit) / 2 GB RAM (32-bit)
Storage: 4 GB of free disk space
Display: 1280 x 768 resolution or higher
Internet: Required for activation and updates

Step 1: Download Microsoft Office 2021 Pro Plus

To download the official installer:

Go to the Microsoft setup page (setup.office.com).
Sign in with your Microsoft account (create one if you don’t have it).
Enter your 25-character product key.
Choose your version (32-bit or 64-bit) and download the installer.

Step 2: Install Microsoft Office 2021 Pro Plus

Locate the setup.exe file you downloaded.
Double-click to launch the installer.
Follow the on-screen instructions.
The installation may take several minutes depending on your system speed.
Once complete, Office 2021 apps will appear in your Start Menu.

Step 3: Activate Microsoft Office 2021 Pro Plus

After installation, activation is required to unlock all features:

Open Word, Excel, or PowerPoint.
You’ll be prompted to sign in with your Microsoft account.
Enter the product key you purchased.
Activation will complete online, and your license will be linked to your account.

👉 If activation fails, try:

Checking your internet connection.
Ensuring the product key matches your version (Office 2021 Pro Plus).
Running the activation troubleshooter in Windows.

Best Place to Buy Microsoft Office 2021 Pro Plus

Microsoft sells Office Pro Plus at a premium, but you can buy it much cheaper from trusted resellers. For example, CheapestKeys.com offers genuine licenses at a fraction of the retail price.

✅ Instant digital delivery
✅ Genuine Microsoft license key
✅ Lifetime activation
✅ Only a one-time payment

Frequently Asked Questions (FAQs)

Q1: What’s the difference between Office 2021 and Microsoft 365?

Office 2021 is a one-time purchase with no subscriptions.
Microsoft 365 requires monthly or yearly payments but includes cloud storage and more frequent updates.

Q2: Can I install Office 2021 Pro Plus on multiple PCs?
The standard license is for one device, but you can purchase multiple keys affordably.

Q3: Will Office 2021 Pro Plus work on Mac?
No, this version is for Windows only. Mac users should purchase Office 2021 for Mac.

Q4: Do I need an internet connection to use Office?
No, once activated, you can use Office offline. However, internet is required for activation and updates.

Q5: Will I still get updates after 2024?
Yes, Microsoft provides security and feature updates for Office 2021 Pro Plus until its official support lifecycle ends.

Final Thoughts

Microsoft Office 2021 Professional Plus remains one of the best productivity suites for professionals and students who prefer a one-time purchase over subscriptions. By following this guide, you can download, install, and activate Office 2021 Pro Plus easily on your PC.

And if you want the best deal, check out CheapestKeys.com where you can get a genuine license key at the lowest possible price.

🚀 Start working smarter today with Microsoft Office 2021 Pro Plus!

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