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Here's how to Fix Microsoft Office Error Code 30015-26.

Here are some steps you can take to fix Microsoft Office Error Code 30015-26:

1. **Repair Office installation.**
Run the Office installer and select "Repair". This will replace any corrupt or missing files that may be causing the error.

2. **Disable antivirus software.**
Some antivirus software can interfere with the Office installation process. Try disabling your antivirus software and then try to install Office again.

3. **Run the Microsoft Support and Recovery Assistant.**
The Microsoft Support and Recovery Assistant can scan your computer for problems and try to fix them automatically.

4. **Reinstall Office.**
If all else fails, you may need to uninstall Office and then reinstall it. Be sure to back up your data before you uninstall Office.

Here are the steps on how to uninstall Office:

1. Open the Control Panel.
2. Click on "Programs and Features".
3. Select the Microsoft Office product that you want to uninstall.
4. Click on "Uninstall".
5. Follow the on-screen instructions to uninstall the product.

Once you have uninstalled Office, you can reinstall it by following the instructions on the Microsoft website.

i. Error code 30015-26 is an error that occurs when Microsoft Office 365 is unable to update. This error can be caused by a number of factors, including:

* A corrupt or missing Office installation
* A problem with your internet connection
* A conflict with your antivirus software
* A problem with your Windows operating system

If you receive error code 30015-26, you can try the following steps to fix the problem:

1. Repair your Office installation.
2. Restart your computer.
3. Check your internet connection.
4. Disable your antivirus software.
5. Update your Windows operating system.

If you have tried all of these steps and you are still receiving error code 30015-26, you can contact Microsoft support for help.

Here are some additional tips that may help you fix error code 30015-26:

* Make sure that you have enough disk space to install the updates.
* Try installing the updates from a different computer.
* Try installing the updates in Safe Mode.
* Run the Microsoft Support and Recovery Assistant.

ii. Error code 30015-11 (-2147023834) is an error that occurs when Microsoft Office is unable to install or update. This error can be caused by a number of factors, including:

* A corrupt or missing Office installation
* A problem with your internet connection
* A conflict with your antivirus software
* A problem with your Windows operating system

If you receive error code 30015-11, you can try the following steps to fix the problem:

1. Repair your Office installation.
2. Restart your computer.
3. Check your internet connection.
4. Disable your antivirus software.
5. Update your Windows operating system.

If you have tried all of these steps and you are still receiving error code 30015-11, you can contact Microsoft support for help.

Here are some additional tips that may help you fix error code 30015-11:

* Make sure that you have enough disk space to install the updates.
* Try installing the updates from a different computer.
* Try installing the updates in Safe Mode.
* Run the Microsoft Support and Recovery Assistant.

iii. Office error 30125-27 (400) is an error that occurs when Microsoft Office is unable to downgrade to a previous version. This error can be caused by a number of factors, including:

* A corrupt or missing Office installation
* A problem with your internet connection
* A conflict with your antivirus software
* A problem with your Windows operating system

If you receive error code 30125-27 (400), you can try the following steps to fix the problem:

1. Repair your Office installation.
2. Restart your computer.
3. Check your internet connection.
4. Disable your antivirus software.
5. Update your Windows operating system.

If you have tried all of these steps and you are still receiving error code 30125-27 (400), you can contact Microsoft support for help.

Here are some additional tips that may help you fix error code 30125-27 (400):

* Make sure that you have enough disk space to install the updates.
* Try installing the updates from a different computer.
* Try installing the updates in Safe Mode.
* Run the Microsoft Support and Recovery Assistant.