Update & Upgrade Problems

How to Fix Error Code 49 When Updating Preinstalled Microsoft Office

Algirdas Jasaitis Sep 29, 2026 869 views

Question details

The user is encountering Error Code 49 while attempting to update a preinstalled version of Microsoft Office or Microsoft 365 on a new computer.

How to Fix Error Code 49 When Updating Preinstalled Microsoft Office

Product: Microsoft Office
Device & OS: not provided
Scenario: Updating a preinstalled Microsoft Office or Microsoft 365 suite on a newly purchased computer.
Observed behavior: The update fails to complete and triggers Error Code 49, typically because the software is not properly activated via the associated Microsoft account or the installation is corrupted.

Before you start

Ensure you have the login credentials for the Microsoft account associated with your Office license and verify that your computer has a stable internet connection.

Solution 1Recommended

Sign in to Verify Your Office License Activation

Error Code 49 often occurs on new computers because the preinstalled Office suite needs to be linked to your Microsoft account before it can process updates.

Unlike older versions of Office, preinstalled Microsoft 365 or Office products typically do not require a 25-character product key. Instead, they authenticate directly through your Microsoft account.

Open Microsoft Word

Launch Microsoft Word or any other preinstalled Office application on your computer.

Navigate to the Account Settings

Click on the 'File' tab in the top-left corner of the window, then select 'Account' from the menu on the left side.

Sign In with Your Microsoft Account

Click the 'Sign In' button and enter the email address and password for the Microsoft account that owns the Office license. Once signed in, attempt the update again.

Solution 2

Run the Office Repair Tool from Control Panel

If signing in does not resolve the error, running a built-in repair tool can fix corrupted installation files that are blocking the update.

Free Microsoft Office alternative

Switch to WPS Office for a Hassle-Free Experience

If Microsoft Office update errors and activation issues are disrupting your workflow, consider switching to WPS Office. It is a powerful, lightweight, and completely free alternative that saves you from dealing with complex licensing issues and frequent update errors.

1. Download WPS Office: Visit the official WPS website and click the free download button.
2. Install the Software: Run the downloaded installer and follow the quick installation guide.
3. Open Your Files: Launch WPS Office and directly open your existing Word, Excel, or PowerPoint documents without losing any formatting.

Completely free to use without mandatory subscriptions or activation errors like Code 49.Highly compatible with Microsoft Office file formats, including .docx, .xlsx, and .pptx.Lightweight installation that runs smoothly even on older or entry-level computers.Familiar user interface ensuring a seamless migration from Microsoft Office.

microsoft office alternative - wps office

Frequently Asked Questions

Do I need a product key to activate preinstalled Microsoft Office?

No, preinstalled Microsoft 365 or Office products typically do not require a separate product key. Activation is usually completed by simply signing in with the Microsoft account associated with the license.

What is the difference between Quick Repair and Online Repair?

Quick Repair fixes common issues by replacing corrupted files locally and does not require an internet connection. Online Repair is a more comprehensive fix that requires the internet to download and completely reinstall the Office components.

Why do I keep getting Error Code 49 when updating Office?

Error Code 49 typically triggers during an update if there is an activation mismatch with the preinstalled software, or if the background update service encounters corrupted installation files on your system.

Installation & Activation