How to Fix Error Code “30015-11” in Microsoft Office?

Error code 30015-11 often appears when users try to install or update Microsoft Office. The installation usually stalls between 90% and 97%, then displays an error message saying “Something went wrong” along with the same error code. This typically signals that the Microsoft Office setup failed due to either corrupted installation files or an incompatible Windows version unable to properly apply Microsoft components.

Common causes of this error include:

• Outdated or incompatible Windows build.
• Leftover or corrupted files from previous Office installations.
• Invalid registry entries.
• Misconfigured XML files interfering with the setup.

Now that the root causes are clearer, here are a few proven methods that have helped many users resolve this issue effectively.

1. Upgrade Windows Using Update Assistant

Sometimes, the current Windows build lacks required update components or contains outdated files that can trigger the error. Running the Windows Update Assistant updates your system to the latest build, replaces corrupted or missing files, and updates .NET components that Office relies on. This creates a smoother environment for installation.

Choose the correct Update Assistant:

• Windows 10 Update Assistant
• Windows 11 Installation Assistant

1. Go to the appropriate page for your Windows version from the links above.
2. Click Download Now under the correct assistant for your system.
3. On the next page, select Update now (Windows 10) or Download now (Windows 11) and save the file.
4. Open the downloaded file and allow the installer to run.
5. Wait while the tool checks your system configuration.
6. When prompted, click Update now to start the upgrade.
7. Let the upgrade process complete without interruptions.
8. Once the installation is done, restart your PC and log in to confirm everything is working properly.

2. Remove Leftover Files Before Reinstalling Microsoft Office

Old or corrupted Office files can linger on your system even after uninstallation, causing conflicts during reinstallation. Removing these files, along with any invalid registry entries, ensures a fresh installation environment.

Step A: Uninstall Microsoft Office

1. Press Win + R, type appwiz.cpl, and press Enter.
   
2. Find Microsoft Office in the list and click the three dots next to it.
3. Select Uninstall and wait for it to finish.
   

Step B: Delete Leftover Files

1. Open File Explorer and navigate to:

   C:\Program Files\Microsoft Office C:\Program Files (x86)\Microsoft Office C:\ProgramData\Microsoft\Office C:\Users\(Your Username)\AppData\Roaming\Microsoft\Office

   

2. Locate the Office folder in each path and delete it.
3. If you cannot delete it, rename it to Office.old.
4. Empty the Recycle Bin and restart your system.
   
5. Once restarted, reinstall Microsoft Office and check if the error is resolved.

3. Reinstall Windows via Bootable USB

Reinstalling Windows through a bootable USB completely formats the system partition, removes any leftover corrupted files, and installs a fresh copy of Windows. This ensures that Office is installed in a clean, stable environment without interference.

Follow this step-by-step guide to install Windows via Bootable USB. This method provides a reliable, clean start for the system.