Running Out of Storage? How Much Space Windows & Office Updates Actually Need

Learn how much temporary disk space Windows and Microsoft 365 updates require, and discover safe, built-in methods to clear storage without changing your subscription.

Running into a "Low Disk Space" warning right in the middle of a workday is incredibly frustrating, especially when you are just trying to keep your system and office software up to date. If you are wondering how much room these updates actually require—and how to make space without losing your important files—we are here to help.

Problem Description: Low Storage During System Updates

When attempting to install routine Windows operating system updates or Microsoft 365 feature rollouts, users frequently encounter errors stating there is insufficient disk space. This prompts confusion over exactly how large these files are, and whether altering, downgrading, or canceling an active Microsoft 365 subscription will alleviate the local hard drive burden.

Quick Answer for Update Space Requirements

Windows and Microsoft 365 updates typically require several gigabytes (often 5GB to 10GB) of temporary free space to download, unpack, and install properly. You can easily safely clear this required room using the Windows "Disk Cleanup" tool. Note that changing or downgrading your Office subscription will not reduce the storage footprint used by these updates or your locally installed applications.

Likely Causes Behind Massive Update File Sizes

• Temporary Extraction Files: Update packages are downloaded in a compressed format and need temporary "breathing room" on your drive to expand before installation.
• Previous Windows Installations: Windows often keeps a backup of your old system files (known as Windows.old) for several days in case you need to roll back an update.
• Update Cache Bloat: Old, already-installed Windows update files frequently remain hidden in your system cache instead of automatically deleting themselves.
• Subscription Misconceptions: Users often assume a "premium" Microsoft 365 subscription downloads heavier software, but all subscription tiers use the same core software installation footprint.

Recommended Solution: Clearing Old Update Caches Safely

1. Click on the Windows Start menu, type Disk Cleanup in the search bar, and press Enter.
2. If prompted, select your primary system drive (usually C:) and click OK.
3. In the initial Disk Cleanup window, look near the bottom and click the button labeled Clean up system files. (You may need administrator permissions).
4. Select your primary drive again if prompted. The tool will take a moment to scan for older system and update files.
5. Scroll through the "Files to delete" list and check the boxes for Windows Update Cleanup, Temporary files, and Temporary Internet Files.
6. Click OK, then select Delete Files to confirm. Wait for the process to finish; it may take several minutes if you have gigabytes of old update data.
7. Restart your computer and re-attempt your Windows or Microsoft 365 update.

Alternative Solutions for Reclaiming Hard Drive Capacity

1. Enable Windows Storage Sense: Go to Settings > System > Storage, and toggle on Storage Sense. This feature automatically clears temporary files and empties your Recycle Bin when space gets low.
2. Uninstall Unused Applications: Navigate to Settings > Apps > Installed Apps, and remove programs or large games you no longer use.
3. Move Media to External Storage: Transfer large video, audio, or image files to an external USB hard drive or a cloud storage provider (like OneDrive or Google Drive).

Working with WPS Office: A Lightweight Alternative

If you find that the Microsoft 365 suite is simply too large for a device with limited storage (such as a smaller laptop or older PC), consider switching to WPS Office. While WPS Office cannot change how Windows handles system updates, it is highly regarded as one of the best free Microsoft Office-compatible alternatives. WPS Office features a significantly smaller installation footprint, meaning it consumes far less of your precious hard drive space while still allowing you to create, open, edit, and save Word, Excel, and PowerPoint documents flawlessly.

Prevention Tips for Avoiding Future Storage Warnings

• Aim to keep at least 15% to 20% of your total hard drive space free at all times to ensure smooth operating system performance.
• Run the Disk Cleanup tool (including the System Files option) once a month to keep update cache bloat in check.
• Configure your browser to automatically clear its download history and cache periodically.
• Store heavy, long-term archival files exclusively on external drives rather than your main C: drive.

FAQs About Office Update Storage and Subscriptions

Will changing to a cheaper Microsoft 365 plan free up disk space?

No. Changing or downgrading an Office subscription generally does not reduce the storage used by locally installed applications or Windows updates. The base software code is essentially the same regardless of your subscription tier.

Can I delete the "Windows Update Cleanup" files safely?

Yes. Deleting these files is completely safe and is highly recommended if you are low on space. The only downside is that you will not be able to uninstall the current Windows updates to roll back to a previous version once those backup files are removed.