How to Fix Microsoft Office 365 Error Code 30175-45 or 30088-26

Dealing with annoying error codes popping up when you’re trying to update Office 365 can be so frustrating! But don’t worry, these issues on Microsoft 365 are usually fixable if you know what to do.

I’ll walk you through the common causes and solutions for error codes 30175-45 and 30088-26 so you can get Office 365 up and running smoothly again.

How to Troubleshoot Issue and Fix Microsoft Office 365 Error Code 30175-45 or 30088-26

Method #1 – Check Your Internet Connection

The number one reason you’ll see errors during an Office 365 update is an unstable internet connection. Downloading and installing updates requires a ton of bandwidth, so you need a strong, dedicated connection throughout the whole process.

Here’s how to optimize your internet connection:

• Use a wired ethernet cable instead of WiFi if you can. Ethernet will give you the fastest, most rock solid connection possible.
• Pause any other devices using your network like phones, tablets, or smart home gadgets. The less traffic on your network, the better.
• Restart your router and modem to clear out any glitches. Just unplug them, wait 30 seconds, then plug them back in.

Once you’ve checked your internet connectivity, try the Office 365 update again. A stable, fast connection should prevent timeout issues during the installation.

Method #2 – Check Available Disk Space on your Windows PC

Another potential culprit is low storage space on your computer. Office 365 and its updates require a certain amount of free disk space to download and install correctly.

To check your free space on Windows:

• Open File Explorer and click This PC on the left pane.
• Look at the numbers under the Devices and Drives section. Make note of the free space on your C: drive.
• Click on the C: drive and select Properties to see a storage usage breakdown.
• Delete any unnecessary files and clear space. Good targets are Downloads, temporary files, system caches, and old documents.
• Run the Disk Cleanup utility to purge unused Windows files.

Around 15-20GB of free space is recommended to safely install Office 365 updates. Once you’ve freed up space, retry the update.

Method #3 – Use Microsoft Office’s Online Repair Tool

If connection and storage issues are ruled out, the problem may lie with Office itself. Corrupted files or issues from previous failed updates can prevent installations from completing successfully.

Luckily, Office has a built-inOnline Repair tool that can automatically detect and fix many common problems.

To run the Office Online Repair:

1. Go to Start > Settings > Apps.
2. Search for Microsoft Office 365 and click on it.
3. Click Modify (or Change on older versions).
4. Click Online Repair and follow the on-screen directions.

This will scan Office and replace any missing or damaged files it finds. When finished, restart your computer and test opening Office again.

Method #4 – Use Command Prompt for Advanced Troubleshooting

If Online Repair doesn’t resolve the installation errors, the Command Prompt offers more advanced troubleshooting options. Here’s how to use it:

1. Search for Command Prompt on the Start menu, right click it, and select Run as Administrator.
2. Type cd C:\Users\%username%\Downloads and press Enter. This navigates to the Downloads folder.
3. Type setup.exe /configure configuration.xml and press Enter.

This runs Office’s setup file while allowing you to pass special parameters to the installation process. There are further instructions on constructing the configuration.xml file to force a repair, remove troublesome software prerequisites, and more.

While the Command Prompt requires some technical skill, it can resolve Office issues beyond what Online Repair alone can fix.

Method #5 – Scan For Corrupt System Files

An underlying problem may be corrupted Windows system files, preventing Office from interacting with the OS properly during installation.

You can scan and automatically repair corrupt system files using the System File Checker tool:

1. Open Command Prompt as Administrator.
2. Type sfc /scannow and press Enter.
3. Wait for the scan to complete. Any issues found will be automatically fixed.

With any corrupted system files repaired, Office should now be able to update and run without errors.

Method #6 – Uninstall and Reinstall Microsoft Office

If all else fails, completely removing Office and starting over with a fresh install can often resolve stubborn errors.

Before uninstalling, make sure you have your Office license key handy. You’ll need to enter it again during reinstallation.

Then follow these steps:

1. Go to Start > Settings > Apps.
2. Search for Microsoft Office 365 and click on it.
3. Click Uninstall.
4. Restart your computer.
5. Reinstall Office fresh from office.com.
6. Enter your license key when prompted.

Hopefully with Office reset, any glitches or inconsistencies plaguing the original install will be eliminated.

Getting Professional Help from Microsoft Customer Service

While the steps in this guide should resolve most common Office 365 error 30175-45 and 30088-26 issues, sometimes professional assistance is needed. Don’t spend hours frustrated – if you’ve tried all the troubleshooting yourself without success, consider contacting Microsoft Support or a local IT specialist.

Hope this helps! Let me know if you have any other questions.