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Sometimes you might get an error saying Something happened and this app couldn’t be installed. Please try again. Error code: 0x80073cf9 when you are trying to install apps from Store on your Windows 10, 8.1, or 8. It is a common error that many Windows users face. If you are having this error at the moment, just take a look at the solutions below.
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How to Fix 0x80073cf9 Store Error on Windows 10/8.1/8
Note: The screens shown below are from Windows 10, but all the fixes also apply to Windows 8 too.
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For Windows 8 users: Restore AUInstallAgent directory in the Windows Folder
0x80073cf9 could be probably caused by the missing AUInstallAgent directory in your Windows 8.
To restore it:
1) On your keyboard, press the Windows logo key 
and E at the same time to invoke the File Explorer window.
2) Go to This PC > Local Disk (C:) > Windows.
3) Right-click on the blank area to click New, then Folder.
4) Click Yes when prompted by User Account Control.
5) Name the new folder: AUInstallAgent.
6) Reboot your Windows 8. Then go to the Windows App Store to install the app again to see if it’s successful.
For Windows 10/8.1 users: Restore AppReadiness directory in the Windows Folder
0x80073cf9 could be probably caused by the missing AppReadiness directory in your Windows 10 or 8.1.
To restore it:
1) On your keyboard, press the Windows logo key and E at the same time to invoke the File Explorer window.
2) Go to This PC > Local Disk (C:) > Windows.
3) Right-click on the blank area to click New, then Folder.
4) Click Yes when prompted by User Account Control.
5) Name the new folder: AppReadiness.
6) Reboot your Windows 10/8.1. Then go to the Windows App Store to install the app again to see if it’s successful.
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Conclusion
That’s all. Hopefully the methods can help you to fix 0x80073cf9 store error on Windows 10/8/8.1.
If the error persists, don’t hesitate to contact us. We will try our best to find other new methods. Thank you for reading, Folks!