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Home/Fix/Fix Windows Error 0x8007066F — Installer Patch Sequencing Failure

How to Fix Fix Windows Error 0x8007066F — Installer Patch Sequencing Failure on Windows

Getting Windows error code 0x8007066F? Installer patch sequencing failure blocking updates or software installation? Fix error 0x8007066F.

Symptoms

You might be experiencing this problem if you notice:

  • •Error 0x8007066F during Windows Update installation
  • •Software updates fail with patch sequencing error
  • •MSI installer returns 0x8007066F during upgrade
  • •Cumulative updates fail to apply with this code
  • •Feature updates roll back citing error 0x8007066F
  • •Application patching fails mid-installation

Common Causes

  • ⚠Previous patches applied out of sequence
  • ⚠Windows Update component store inconsistency
  • ⚠Corrupted installer cache preventing proper sequencing
  • ⚠Third-party software conflicting with update process
  • ⚠Incomplete previous update leaving inconsistent state
  • ⚠Windows Installer service database corruption

Solutions

Solution 1: Reset Windows Update Components

  1. 1Open Command Prompt as Administrator
  2. 2Stop update services:
  3. 3net stop wuauserv
  4. 4net stop cryptSvc
  5. 5net stop bits
  6. 6net stop msiserver
  7. 7Rename update cache folders:
  8. 8ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
  9. 9ren C:\Windows\System32\catroot2 catroot2.old
  10. 10Restart services:
  11. 11net start wuauserv
  12. 12net start cryptSvc
  13. 13net start bits
  14. 14net start msiserver
  15. 15Try the update again

Solution 2: Run DISM and SFC Repair

  1. 1Open Command Prompt as Administrator
  2. 2DISM /Online /Cleanup-Image /RestoreHealth
  3. 3Wait for completion (may take 15-20 minutes)
  4. 4sfc /scannow
  5. 5Wait for verification to complete
  6. 6Restart PC
  7. 7Retry the failed update or installation

Solution 3: Clear Windows Installer Cache

  1. 1Open Run dialog: Win+R
  2. 2Type: %windir%\Installer
  3. 3This folder contains installer cache files
  4. 4Do NOT delete files from this folder manually
  5. 5Instead, use Disk Cleanup:
  6. 6Win+R → cleanmgr → Enter
  7. 7Select your system drive
  8. 8Click "Clean up system files"
  9. 9Check "Windows Update Cleanup" and "Temporary files"
  10. 10Click OK and confirm deletion
  11. 11Restart PC and retry installation
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