This quick guide shows you how to install and activate Office 2021 Professional Plus using the official installer and phone activation method. Follow each step carefully to complete your setup smoothly.
Step 1 — Uninstall Previous Office Versions
- Open the Start menu and type “Add or remove programs”.
- Locate all existing Microsoft Office installations.
- Select each and click Uninstall.
- Restart your PC after uninstallation.
Removing older versions helps prevent conflicts during activation.
Step 2 — Install Office 2021
Download and install Microsoft Office 2021 using the installer below.
- Open the downloaded file and run.
- Follow the on-screen prompts until the installation is complete.
Step 3 — Activate by Phone
- Open any Office app (Word, Excel, etc.).
- Click your profile icon in the top-right corner and sign out of all accounts.
- Go to File → Account → Change License.
- Choose Enter a product key instead and enter your key.
- Select Activate by Phone when prompted.
- Visit Microsoft’s Activation Centers page below to find your country’s number. Or use the toll-free number provided beneath your region
- Call the listed number and provide your Installation ID shown on screen.
- Enter the Confirmation ID you receive to complete activation.
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