Download Microsoft Office 2021 Professional Plus: Complete Guide

Microsoft Office 2021 Professional Plus is the most complete one-off licence edition of Office, bundling Word, Excel, PowerPoint, Outlook, Access, Publisher, Teams and Skype for Business into a single perpetual package. Unlike Microsoft 365, it is a buy-once product: you pay a single fee and use it indefinitely on the device it is installed on, with no monthly subscription. This guide explains exactly what is included, how to download the installer depending on your licence type, how to activate your key and how to get help if something goes wrong.

Downloading Microsoft Office 2021 Professional Plus installer on Windows 11

What Is Included in Professional Plus?

Professional Plus is the top-tier edition of Office 2021 for Windows. It includes every Office desktop app -- Word, Excel, PowerPoint and Outlook -- plus Access (relational databases) and Publisher (desktop publishing), which are not available on macOS or in the Standard edition. You also get Teams and Skype for Business for corporate communication. For a direct comparison with the lighter edition, see our breakdown of what's new in Office 2021 Standard and Office 2019 vs 2021 if you are still deciding which release to buy.

Licence Types: Bound vs OEM

Licendi supplies two main types of Office 2021 Professional Plus licence, and the download route depends on which one you own:

  • Bound -- tied to your Microsoft account. You download the installer directly from account.microsoft.com after signing in, and activation happens automatically.
  • OEM -- tied to the hardware it is first activated on. Installation is performed using a standalone ISO image, with the product key entered manually during setup.

If you are unsure which variant you have, our guide to OEM vs Retail vs Bound licences walks through the differences and what each means for transfers, reinstalls and support.

How to Download a Bound Licence

  1. Sign in at account.microsoft.com using the email linked to your licence.
  2. Open Services & subscriptions or Order history.
  3. Click Install next to Office 2021 Professional Plus.
  4. Run the downloaded setup file and follow the on-screen prompts. Activation should complete automatically once you finish installing.

How to Download an OEM Licence (ISO Method)

  1. Download the Office 2021 ISO from the Microsoft Evaluation Centre or the direct link provided in your Licendi order email.
  2. Mount the ISO (right-click the file and choose Mount in Windows 10 or 11).
  3. Run setup.exe from the mounted virtual drive.
  4. Enter your 25-character product key when prompted, or activate after installation via File > Account > Activate Product.

For a more detailed walkthrough covering both scenarios, follow our Office installation step-by-step guide.

System Requirements

  • Operating system: Windows 10 or Windows 11 (64-bit recommended)
  • Processor: 1.6 GHz dual-core or faster
  • Memory: 4 GB RAM (8 GB recommended for heavier workloads in Excel and Access)
  • Storage: 4 GB of available disk space
  • Display: 1280 x 768 screen resolution or higher

Tips for Getting Started

Once installation is complete, it is worth spending ten minutes on housekeeping. Run Windows Update first, then open any Office app and check for updates under File > Account > Update Options > Update Now. Sign in to OneDrive (even with a free personal account) if you want AutoSave and cloud backup of your documents. Finally, pin Word, Excel and Outlook to your taskbar to cut the time it takes to launch them day to day.

If you are weighing up a perpetual licence against a subscription, our comparison of Office 2021 vs Microsoft 365 explains when each makes financial sense.

Buy Office 2021 Professional Plus from Licendi

Licendi offers genuine Office 2021 Professional Plus licences at competitive prices, with immediate digital delivery, a verified activation key and UK-based support if you run into problems. Every licence is backed by our satisfaction guarantee, so you can install with confidence.

Best regards,
The Licendi Team