What causes the Office Update Error 30015-26?

There are various reasons for this Office update error; some of the common ones are mentioned here:

Corrupted system files – If the system files on your computer are damaged or missing, you might face this error. To fix it, you must repair the system files via Command Prompt. Connectivity issue – If your internet connection is weak or unstable, Office might not be able to connect to the server to download the update, hence the error. Check your internet connection or use another one. Corrupted installation files – If the previous installation files for Office are corrupted, then a conflict could lead you to this error. You need to repair the Office app to fix it. Insufficient space – If your computer is low on disk space, then the update will not be downloaded successfully, hence the error. To retrieve space, remove unnecessary files and apps from the PC. Third-party app interference – This error could appear if any third-party apps create conflict and doesn’t let Office connect to the server. Consider removing unwanted third-party apps.

Now that we know the causes, let’s move to the fixes to resolve the issue.

What can I do to fix the Office Update Error 30015-26?

Before engaging in advanced troubleshooting steps, consider performing the following checks:

Uninstall unwanted third-party apps. Restart your computer in a clean boot environment. Make sure your Windows is up to date.

If these simple tweaks didn’t fix your issue, let’s move to the detailed steps.

1. Disable antivirus temporarily

Once you have updated Office successfully, follow the same steps to enable Real-time protection, as it is important to keep your Windows secure.

2. Disable Firewall

3. Run an SFC scan

If this process takes too long or doesn’t work, you can better use a dedicated application that will diagnose your PC in a minute. Fortect can detect any damaged files on your system and offer a detailed summary of the issues that will be solved efficiently. ⇒ Get Fortect

4. Repair the Office app

5. Run Program Install and Uninstall troubleshooter

6. Reinstall the Office app

6.1 Uninstall the app

Please wait until the program disappears from the list.

6.2 Reinstall the app

We also recommend reading our article on Office Update Error 30088-26 because the problem is similar. So, these are methods you need to follow to fix the Office Update Error 30015-26. Try them and let us know what worked in the comments section below.

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