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How to Fix Fix Error 0x80073D09 — Store App Package Blocked by Policy on Windows

Getting error 0x80073D09 when installing Store apps? App installation blocked by policy? Microsoft Store says app can't be installed due to policy restriction? Sideloading disabled error? Fix this app package policy error.

Symptoms

You might be experiencing this problem if you notice:

  • •Microsoft Store app installation fails with 0x80073D09
  • •Error message says installation blocked by system policy
  • •Sideloaded apps rejected with this error code
  • •Developer mode apps fail to install
  • •App installation works for admin but not standard users
  • •Enterprise apps won't install via Company Portal

Common Causes

  • ⚠Sideloading disabled in Windows Settings
  • ⚠Group Policy blocks app installation from outside Store
  • ⚠MDM policy restricts app sources
  • ⚠Developer mode not enabled for dev packages
  • ⚠AppLocker or Windows Defender Application Control blocking
  • ⚠User account doesn't have permission to install apps

Solutions

Solution 1: Enable Sideloading and Developer Mode

  1. 1For Windows 11:
  2. 2Settings → Privacy & security → For developers
  3. 3Toggle "Developer Mode" ON if installing dev packages
  4. 4Or just ensure "Install apps from any source" is selected
  5. 5For Windows 10:
  6. 6Settings → Update & Security → For developers
  7. 7Select "Sideload apps" or "Developer mode"
  8. 8Accept the confirmation prompt
  9. 9Restart may be required
  10. 10Retry app installation after enabling
  11. 11Note: Developer Mode enables additional features like SSH server

Solution 2: Fix Group Policy Restrictions

  1. 1If managed by organization:
  2. 2Contact IT administrator — policy may be intentional
  3. 3For personal PCs with leftover policy:
  4. 4gpedit.msc → Computer Configuration
  5. 5→ Admin Templates → Windows Components → App Package Deployment
  6. 6Set "Allow all trusted apps to install" to Enabled
  7. 7Set "Allow development of Microsoft Store apps..." to Enabled
  8. 8Also check:
  9. 9→ Windows Components → Microsoft Store
  10. 10Ensure "Disable all apps from Microsoft Store" is Not Configured
  11. 11Run gpupdate /force after changes
  12. 12Restart PC

Solution 3: Fix AppLocker or WDAC Blocking

  1. 1If AppLocker is configured:
  2. 2secpol.msc → Application Control Policies → AppLocker
  3. 3Check Packaged app Rules — look for deny rules
  4. 4You may need to create allow rules for the specific app
  5. 5If Windows Defender Application Control (WDAC) is active:
  6. 6Check: Get-CimInstance -ClassName Win32_DeviceGuard -Namespace root/Microsoft/Windows/DeviceGuard
  7. 7WDAC policies are more restrictive and harder to modify
  8. 8For enterprise environments: work with IT to whitelist the app
  9. 9For personal PCs with stale WDAC policy:
  10. 10Delete policy files from C:\Windows\System32\CodeIntegrity\CIPolicies\Active
  11. 11Restart PC — but be careful as this removes all WDAC protection
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