How to Fix Fix Error 0x8007049A — Windows Update Dependency Conflict on Windows
Getting error 0x8007049A during Windows Update? Update dependency conflict detected? Prerequisite update missing or conflicting? Cumulative update failing due to dependency chain? Fix this Windows Update dependency conflict error.
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Main Troubleshooting Guide
How to Fix Windows Update Errors →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Windows Update fails with error 0x8007049A
- •Cumulative update requires a prerequisite that also fails
- •Multiple updates fail in sequence with dependency errors
- •Feature update blocked by pending prerequisite updates
- •Update history shows repeated dependency failures
- •CBS log shows component dependency resolution failure
Common Causes
- ⚠Required prerequisite update not installed or corrupted
- ⚠Update component store has conflicting package versions
- ⚠Previous update partially installed breaking dependency chain
- ⚠Servicing stack update outdated or missing
- ⚠Windows component store corruption
- ⚠Third-party software blocking prerequisite installation
Solutions
Solution 1: Install Servicing Stack Update First
- 1Servicing stack updates must be installed before cumulative updates:
- 2Check for SSU in Microsoft Update Catalog:
- 3catalog.update.microsoft.com
- 4Search: "servicing stack update" + your Windows version
- 5Download and install the latest SSU manually
- 6Restart PC
- 7Then retry the cumulative update via Windows Update
- 8If SSU also fails:
- 9CMD as Admin:
- 10DISM /Online /Cleanup-Image /RestoreHealth
- 11sfc /scannow
- 12Restart and retry SSU installation
Solution 2: Reset Update Components
- 1Clear the dependency chain by resetting components:
- 2CMD as Admin:
- 3net stop wuauserv
- 4net stop cryptsvc
- 5net stop bits
- 6net stop msiserver
- 7ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
- 8ren C:\Windows\System32\catroot2 catroot2.old
- 9net start wuauserv
- 10net start cryptsvc
- 11net start bits
- 12net start msiserver
- 13Check for updates again
- 14Install any available updates one at a time if possible
Solution 3: Manual Update Installation
- 1Bypass dependency issues with manual installation:
- 2Go to catalog.update.microsoft.com
- 3Search for the specific KB number that failed
- 4Download the standalone installer (.msu)
- 5Install by double-clicking the .msu file
- 6If it reports dependency missing:
- 7Search for the prerequisite KB and install it first
- 8Then install the original update
- 9For persistent failures:
- 10Download Windows 10/11 Update Assistant
- 11Or use Media Creation Tool for in-place upgrade
- 12This rebuilds the entire update chain cleanly
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