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  • Software and digital services
  • Operating system

0x80073CF9

Windows 0x80073CF9 on operating system: app install failed

Verified with sources6 sourcesReviewed Oct 18, 2026
Technician coming? See the 2 steps they must show you

Risk level

Low

Usually safe to check without specialist tools.

Urgency

Medium

Quick answer

Error 0x80073CF9 (ERROR_INSTALL_FAILED or ERROR_INSTALL_PACKAGE_NOT_FOUND) on Windows means a Microsoft Store or MSIX/AppX package installation failed, commonly because a required dependency package such as VCLibs, .NET, or WinAppSDK runtime is missing or updates are pending.

Safety first

Safe checks you can perform

  • Inspect the AppxDeployment-Server log in Event Viewer and Get-AppxLog
  • Install the latest Windows updates and update Microsoft Store
  • Verify and install dependency packages (VCLibs, .NET, WinAppSDK runtime)
  • Repair, reset, or reinstall the app and run the Windows Store Apps troubleshooter

Leave these tasks to a qualified professional

  • Do not attempt this professional task: Deployment log diagnosis with Microsoft Support
  • Do not attempt this professional task: Package verification with the software vendor

What a technician must be able to justify

Technician visit

These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.

These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.

  1. Deployment log diagnosis with Microsoft Support

    What they doUse Contact Microsoft Support, enter the problem, select Get Help, and select Contact Support with your AppxDeployment-Server and Get-AppxLog details.

    They must show youThe specific Error or Critical events in Applications and Services Logs > Microsoft > Windows > AppxDeployment-Server and Get-AppxLog output..

    In writingInner error code from AppxDeployment-Server, verified dependency packages, and Microsoft Support case ID..

  2. Package verification with the software vendor

    What they doContact the software vendor or app publisher when Event Viewer confirms ERROR_INSTALL_FAILED (0x80073CF9) during package installation.

    They must show youThe 0x80073CF9 error message and the corresponding event log entry in Microsoft-Windows-AppXDeploymentServer/Operational..

    In writingAffected package version, required dependency frameworks, and vendor remediation guidance..

Before accepting a part or repair

Nothing has been shown yet. Do not accept a part swap based on the code alone.

Follow these steps

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

  1. Inspect the AppxDeployment-Server log in Event Viewer and Get-AppxLog

    No special tools

    Who:
    user
    How:
    Open Event Viewer (eventvwr.msc) and navigate to Applications and Services Logs > Microsoft > Windows > AppxDeployment-Server, or run Get-AppxLog | Out-GridView in PowerShell to inspect recent deployment events.
    Result that matters:
    Event Viewer and PowerShell display the specific inner error code and description matching the failed installation time.
    If If the log identifies a missing dependency or specific package condition, follow the logged remediation.
    If If you are installing from Microsoft Store without manual packages, check Windows Update and Store updates next.
    Evidence to keep:
    Critical, Error, or Warning event details in AppxDeployment-Server or Get-AppxLog output.

    Evidence: MSIX deployment troubleshooting - MSIX | Microsoft Learn · Troubleshooting packaging, deployment, and query of Windows apps - Win32 apps | Microsoft Learn

  2. Install the latest Windows updates and update Microsoft Store

    No special tools

    Who:
    user
    How:
    Sign in to your Microsoft account, select Start > Settings > Windows Update > Check for updates and select Install now if available, then open Microsoft Store and select Library > Get updates.
    Result that matters:
    Windows and the Microsoft Store app are updated to their latest available versions.
    If If reinstalling the app from Microsoft Store Library succeeds without 0x80073CF9, the issue is resolved.
    If If you are deploying an .msix or .appx package and the error persists, verify all dependency packages.
    Evidence to keep:
    Update status in Windows Update and Microsoft Store Library.

    Evidence: Fix problems with apps from Microsoft Store

  3. Verify and install dependency packages (VCLibs, .NET, WinAppSDK runtime)

    No special tools

    Who:
    user
    How:
    Ensure all dependency packages (VCLibs, .NET, Windows App SDK runtime) are installed before the main package, or install them together in PowerShell using Add-AppxPackage main.msix -DependencyPath dep1.msix, dep2.msix.
    Result that matters:
    All required framework dependencies are registered alongside the main app package.
    If If the package installs cleanly after supplying the dependencies, the missing dependency caused 0x80073CF9.
    If If a Microsoft Store app still fails, repair, reset, or reinstall the app in Windows.
    Evidence to keep:
    Successful completion of Add-AppxPackage with -DependencyPath in PowerShell.

    Evidence: MSIX deployment troubleshooting - MSIX | Microsoft Learn

  4. Repair, reset, or reinstall the app and run the Windows Store Apps troubleshooter

    No special tools

    Who:
    user
    How:
    Repair or reset the app in Windows Settings, select Library > Install in Microsoft Store to reinstall it, or on Windows 10 go to Settings > Update & Security > Troubleshoot > Windows Store apps > Run the troubleshooter.
    Result that matters:
    Windows repairs or resets the app registration and downloads a fresh copy from your Microsoft Store Library.
    If If the app installs and opens normally, no further troubleshooting is required.
    If If error 0x80073CF9 remains, contact the software vendor or Microsoft Support.
    Evidence to keep:
    App installation state in Microsoft Store Library and troubleshooter completion report.

    Evidence: Fix problems with apps from Microsoft Store

Still not solved

If the error persists, stop here. See what the technician must do and show you.

Where this code applies

A code is meaningful only inside the right product and version context.

Primary scope

System
Software and digital services
Brand
Microsoft Windows
Product type
Operating system

Known code variants

  • 0x80073cf9 Windows
  • error 0x80073CF9 Microsoft Store
  • ERROR_INSTALL_FAILED
  • ERROR_INSTALL_PACKAGE_NOT_FOUND
  • Microsoft Store error 0x80073CF9

What it means

Error code 0x80073CF9 occurs on Windows when installing or updating an app from Microsoft Store or deploying an .msix or .appx package. Official Microsoft Learn documentation lists 0x80073CF9 both as ERROR_INSTALL_FAILED (package install failed) and, in the MSIX deployment troubleshooting guide, as ERROR_INSTALL_PACKAGE_NOT_FOUND when the package or a dependency package cannot be found during installation. Detailed inner error codes are recorded in Event Viewer under AppxDeployment-Server and via Get-AppxLog in PowerShell. An error code alone never proves that computer hardware is faulty or that a software license is invalid.

Symptoms and causes

Probable causes · in order

  • Missing main package or required dependency package during installationCommon

    The installation fails with ERROR_INSTALL_PACKAGE_NOT_FOUND when the package itself or a required dependency framework such as VCLibs, .NET, or the Windows App SDK (WinAppSDK) runtime is not installed.

    Evidence: MSIX deployment troubleshooting - MSIX | Microsoft Learn

  • Pending Windows Update or outdated Microsoft Store appPossible

    Installing or updating Store apps while Windows 10 or Windows 11 or the Microsoft Store client itself lacks the latest updates can trigger installation failures.

    Evidence: Fix problems with apps from Microsoft Store

  • Underlying package deployment failure logged in AppXDeployment-ServerPossible

    The deployment engine returns 0x80073CF9 (ERROR_INSTALL_FAILED) due to an app state issue or vendor package error recorded in the Microsoft-Windows-AppXDeploymentServer/Operational log.

    Evidence: Troubleshooting packaging, deployment, and query of Windows apps - Win32 apps | Microsoft Learn

Virtual technician

Does 0x80073CF9 still appear after these checks?

Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.

Start diagnosis

Sources and technical references

  1. 1

    Fix problems with apps from Microsoft Store

    Microsoft · 2026 · official_doc

  2. 2

    Solucionar problemas relacionados con las aplicaciones de Microsoft Store

    Microsoft · 2026 · official_doc

  3. 3

    MSIX deployment troubleshooting - MSIX | Microsoft Learn

    Microsoft · 2026 · official_doc

  4. 4

    Solución de problemas de implementación de MSIX - MSIX | Microsoft Learn

    Microsoft · 2026 · official_doc

  5. 5

    Troubleshooting packaging, deployment, and query of Windows apps - Win32 apps | Microsoft Learn

    Microsoft · 2026 · official_doc

  6. 6

    Solución de problemas de empaquetado, implementación y consulta de aplicaciones de Windows - Win32 apps | Microsoft Learn

    Microsoft · 2026 · official_doc

Sources: Fix problems with apps from Microsoft Store · Solucionar problemas relacionados con las aplicaciones de Microsoft Store · MSIX deployment troubleshooting - MSIX | Microsoft Learn · Solución de problemas de implementación de MSIX - MSIX | Microsoft Learn · Troubleshooting packaging, deployment, and query of Windows apps - Win32 apps | Microsoft Learn · Solución de problemas de empaquetado, implementación y consulta de aplicaciones de Windows - Win32 apps | Microsoft Learnreviewed 2026-10-18 · verified

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