How to fix
Office update error 30015-26
on Windows

Hi, I keep trying to update my Microsoft Office, and I keep getting an error 30015-26 (3) with the message "Something went wrong." I sometimes encounter usability issues, which I assume are because of this as well. Any ideas on how to fix it?

Microsoft Office is a suite of productivity applications that is used by millions of people worldwide for work, school, and personal projects. It includes popular software like Word, Excel, PowerPoint, and Outlook, among others. The applications are designed to help users create and edit various types of documents, spreadsheets, presentations, and emails.

However, some users encounter an error when trying to update their Office apps. This error is known as the 30015-26 (3) error and can also occur as the 30015-26 (1006) error under similar circumstances. Users may also notice that their Office apps start malfunctioning after encountering this error, which can cause delays in completing projects and assignments.

It is a common issue that affects many users and can cause significant usability problems. The error message reads:

Something went wrong

Sorry, we ran into a problem.

Go online for additional help.
Error code: 30015-26 (3)

In other cases, users might be directed into restarting their PCs in order to fix the error, although that rarely helps. Still, we recommend you try it first. 

There are several reasons why this error might occur. Third-party security software can block the update, or corrupted system files or Office itself can cause it. Other factors like connectivity issues, insufficient disk space, or incomplete installation of previous updates can also be the culprit.

In conclusion, the 30015-26 error is a common problem that Office users encounter when trying to update their applications. We provide several solutions for this issue below, so follow the step-by-step guide. We also recommend trying an automatic approach with the help of [d1] PC repair, which can quickly and easily replace corrupted Windows files.

Fix 1. Try troubleshooters

First, we would recommend running Windows Store Apps and Windows Update troubleshooters as follows:

• Type troubleshoot in Windows search and press Enter.
• Select Additional troubleshooters/Other troubleshooters.
• Scroll down to find Windows Store Apps and click Run the troubleshooter/Run.
• Let the scan finish and apply the suggested fixes.
• Next, run the Windows Update troubleshooter in the same way.

Fix 2. Repair Office

There's a built-in repair function that you can use to repair the Office suite.

• Type Control Panel in Windows search and press Enter.
• Select Programs > Programs and Features.
• Select Microsoft Office and click on Change.
• Choose the option for Online Repair and click Repair.
• Follow the prompts to finish the process.

Fix 3. (Re)start Windows update and BITS services

Make sure responsible services are running. If they are, restart them instead.

• Click Start and type Services into the search bar.
• Click on the Services app to open the Services window.
• Scroll down the list of services and locate the Background Intelligent Transfer Service and Windows Update Service
• Right-click on each service and select Restart from the context menu.
• If the service is not running, double-click it, and under Startup type, select Automatic.
• Then, click Start, Apply and OK.

Fix 4. Check for corrupted files

• Type cmd in Windows search.
• Right-click on Command Prompt search result and select Run as administrator.
• UAC (User Account Control) will ask whether it can make changes, click Yes.
• Next, copy and paste the following command and press Enter:
  sfc /scannow
• Once done, run the following commands as well:
  dism /online /cleanup-image /scanhealth
  dism /online /cleanup-image /checkhealth
  dism /online /cleanup-image /restorehealth
• Restart your PC.

Fix 5. Disable or uninstall third-party software

Third-party security software, VPNs, and firewalls can cause Office update errors because they can interfere with the update process. These security programs are designed to protect the user's system by monitoring and controlling network traffic, which can sometimes block legitimate applications and updates from running properly.

When a user tries to update Office, the update program tries to establish a connection with Microsoft's servers to download and install the latest updates. However, security software, VPNs, and firewalls can mistakenly identify this connection as a potential threat and block it.

Additionally, some security software may not be compatible with Office updates or may interfere with certain files or components required for the update to run correctly. This can cause Office update error 30015-26 to occur.

Fix 6. Reinstall Office

If none of the above solutions helped, try reinstalling the app.

• Right-click on Start and pick Apps and Features.
• Scroll down to find the MS Office installation.
• Click Uninstall and confirm with Uninstall.
• Follow on-screen instructions to remove the app completely.
• Reboot the PC and then reinstall Microsoft office.

Note: if this doesn't work, you might have to use a thorough uninstall of the Office suite by using a special tool from Microsoft [download link]. You can also download it from the official website.