Windows Failed to Install the Following Update with Error 0x80073d02: Fix Corrupt ISO Files in 5 Simple Steps

Windows failed to install the following update with error 0x80073d02 because your system is trying to download a corrupted ISO file—something I’ve seen block updates on dozens of machines. 💻 This specific error points directly to a broken update package, often caused by interrupted downloads or disk issues.

The good news? We can reset the Windows Update components in under 10 minutes without reinstalling the OS.

First, let’s rule out the simplest fixes: restart your PC and run the built-in Windows Update Troubleshooter. If that fails, we’ll clear the update cache manually using services.msc to stop the Windows Update service, delete the SoftwareDistribution folder, and restart it.

This clears corrupted files without touching your data—something Microsoft’s own docs recommend for persistent update errors.

For stubborn cases, we’ll move to advanced tools like DISM and SFC scans to repair system file corruption that might be blocking the update. If the ISO remains problematic, we’ll download it directly from Microsoft’s Update Catalog as a clean, uncorrupted file.

Each step builds on the last, so we tackle the most likely causes first.

Once resolved, you’ll avoid this error in the future by monitoring disk space, disabling third-party update blockers, and running regular maintenance scans. The key is acting methodically—skipping steps rarely works, but following this order does.

Underlying Causes Of The Update Error

When Windows encounters the 0x80073d02 error during an update, it’s usually due to a mismatch or corruption in the update package itself—often tied to how Windows validates and processes ISO files or digital signatures.

Below are the most common root causes, explained in detail so you can pinpoint the issue and fix it effectively.

1. Corrupted or incomplete update files

The 0x80073d02 error often surfaces when Windows fails to verify the integrity of downloaded update files. This can happen if:

• Partial downloads: If the update package is interrupted (e.g., due to a poor internet connection, sudden shutdown, or disk space issues), the downloaded files may become fragmented or incomplete.
• Cache corruption: Windows stores update files in the SoftwareDistribution folder. If this cache gets corrupted—whether from a failed update attempt, malware interference, or manual interference—the system may fail to process the update correctly.
• File system errors: Bad sectors on your hard drive or a failing SSD can lead to read/write errors, causing Windows to misread critical update files.

Why it happens: Windows uses cryptographic hashes (SHA-256) to verify file integrity. If the hash doesn’t match the expected value, the update installation halts with 0x80073d02.

2. Expired or invalid digital signatures

Windows updates are digitally signed by Microsoft to ensure authenticity. If the signature is:

• Expired: Older updates (especially cumulative updates) may rely on signatures that are no longer valid due to Microsoft’s certificate rotation policy.
• Tampered with: Third-party tools (e.g., VPNs, firewalls, or security software) might interfere with the signature verification process.
• Missing: Some updates require intermediate certificates that aren’t properly installed on your system.

Why it happens: The error 0x80073d02 often maps to CRYPT_E_SECURITYSETTINGS in Windows error codes, indicating a failure in cryptographic validation. This can occur if the system clock is incorrect (affecting signature expiration checks) or if the Windows CryptoAPI fails to process the signature.