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Fix 0x80240066 Microsoft Store Error Code When Installing Apps
Some Windows 11/10 users failed to install apps from Microsoft Store because of the error code 0x80240066. You may also see this error while installing an update for an app from Microsoft Store. This error code is not associated with a particular app. You may get this error while downloading or installing any app. An unstable internet connection is the most common reason for Microsoft Store apps not getting installed on a Windows PC. Hence, check your internet connection. It will be better if you connect your system to the WiFi via an ethernet cable. If the issue still appears, use the solutions provided below to fix the 0x80240066 Microsoft Store error code while installing apps.
Microsoft Store errors also occur due to corrupted system files. You should run SFC and DISM scans to repair the corrupted system files (if any). In addition to this, you should also check for Windows Update. Microsoft recommends users keep their systems always up to date in order to make their systems more secure than before and eliminate possible errors. We also suggest you check if the date and time are set correctly on your computer. If these basic fixes do not help, use the solutions provided below to fix the 0x80240066 Microsoft Store error code when installing apps.
Let's see all these fixes in detail.
1] Run Windows Store Apps Troubleshooter
Windows Store Apps Troubleshooter is developed to resolve Windows Store app issues. Because you are unable to install or update apps from Microsoft Store, running the Windows Store Apps Troubleshooter may resolve your problem. 2] Temporarily disable your antivirus Sometimes, the problem occurs due to antivirus. If your antivirus is preventing Microsoft Store from installing the apps on your computer, you will not be able to install or update the apps. The simplest way to check this is to disable your antivirus temporarily and then install the app from Microsoft Store. You can enable your antivirus again. 3] Repair or reset Microsoft Store 
Resetting Microsoft Store clears cache files. This action is helpful if the issue is occurring due to the corrupted Windows Store cache. Repair or reset the Microsoft Store app and see if you can install or update apps from it or not. 4] Uninstall the app using PowerShell You need to uninstall the app using Remove-AppxPackage and then download the app from Microsoft Store. As described above, the error can occur with any app while updating or installing it from Microsoft Store. If you are unable to update pre-installed apps, you should uninstall them completely and then reinstall them. Do note that uninstalling a pre-installed app from Windows 11/10 Settings does not remove it completely from your computer. You have to execute a command in Windows PowerShell in order to remove it completely. 5] Toggle the Developer mode By default, Windows 11/10 does not allow users to install apps from sources other than Microsoft Store. If you want to install apps from other sources, you can use PowerShell for the same. But before this, you have to enable the "Sideloaded apps" feature in Windows 10. On the other hand, in Windows 11, you just have to enable the Developer mode for that. If you are unable to install unsigned .Appx app package using PowerShell, we suggest you enable these options. 
Sometimes, the Developer mode creates issues while installing apps from Microsoft Store. If these options are already enabled on your system, the error code 0x80240066 might be appearing due to this. Disable the Developer mode (in Windows 11) or switch from Sideloaded apps to Microsoft Store apps (in Windows 10) and try again. This should work. 6] Restore your system We also suggest you restore your system and see if it helps. The System Restore tool will take your system to the previous working state by using the restore point created on your system. While performing this action, you can select the restore point as per the date on which it was created. How do I fix Microsoft Store not reinstalling the Microsoft Store? Microsoft Store installation error occurs due to several reasons. These causes include corrupted system files, corrupted Windows Store cache, unstable internet connection, incorrect date and time, etc. To fix Microsoft Store errors, run the appropriate troubleshooter, reset Windows Store cache, etc. How do I fix apps not installing in Microsoft Store? Check if you are running out of disk space or not. You should also check your internet connection and the date and time. If the problem still persists, disable your antivirus and firewall and try again. Repairing or resetting the Microsoft Store app works in most cases. Read next: Fix 0xC03F6603 Microsoft Store error in Windows. How Apple Could Fix The Issue With "Installed" Mac App Store Apps
How Apple Could Fix The "Installed" Mac App Store IssueSince the Mac App Store launched yesterday, hundreds (if not thousands) of users noticed that apps previously installed on a Mac through a developer's website show up as, well, "installed" on the Mac App Store. That may lead you to think the new Store can handle updates for apps purchased and downloaded out of it just fine, but it can't. Either a bug or a "feature" in Apple's system, those apps seems to be "installed" simply because the Mac App Store sees the bundle identifier of an app already present on your Mac's hard drive. So say you have iPhoto, Pages, Panic's Coda or Coversutra already installed on your Mac and you fire up the Mac App Store, those apps may be listed as "Installed". But they won't go through the handy automatic update process apps you really purchase in the Mac App Store have. It happened to me. And if you ask me, that's bad user experience.
Daylen Yang has an interesting mockup on his personal blog of a simple feature that could fix this issue of apps showing up as "Installed". Apple could simply offer a way to re-purchase applications found on your Mac although, yes, you'd have to pay again. But considering that several developers are moving to App Store-exclusive applications offering discounted prices now looking forward to future free version upgrades (example: you can buy Pixelmator again now at $29, but the future 2.0 version will be a free update), it doesn't sound like a bad idea. Or, Apple could evolve the concept seen in this mockup developing a way for the Mac App Store to recognize installed apps and provide more detailed information and options about what you can do.
Microsoft Store Installed By Multiple Users Fails To Start On Windows 11/10
In today's post, we will look at the anomaly and the possible solution – whereby a Microsoft Store cannot start when one user installs an older version than the current version installed by another user in Windows 11/10. This issue can also occur when System Center Configuration Manager is used to deploy the older version of an offline app and then a user updates the app online from the Microsoft Store.
Microsoft Store installed by multiple users fails to start
Consider the following scenario:
In this scenario, User A can no longer use the app when signed in. Also, User B when signed in, cannot update the app – and this is due to the older version of the app installed by User B has replaced shared files with older versions.
As prescribed by Microsoft, the following steps can fix this issue for users on a specific Windows 10 computer:
1. Confirm that the activationStore.Dat file does not exist in the AppRepository directory. For example: C:\ProgramData\Microsoft\Windows\AppRepository\Packages\Microsoft.MinecraftEducationEdition_0.21.0_x64__8wekyb3d8bbwe\ActivationStore.Dat 2. Run the following command to set the registry key for the specific application. For example for Minecraft (Microsoft.MinecraftEducationEdition_1.0.21.0_x64__8wekyb3d8bbwe):\ Do reg add HKLM\Software\Microsoft\Windows\CurrentVersion\AppModel\StateChange\PackageList\Microsoft.MinecraftEducationEdition_1.0.21.0_x64__8wekyb3d8bbwe /v PackageStatus /t REG_DWORD /d 2 3. Copy the application.Appx file to a local folder, for example: C:\Temp\ Microsoft.MinecraftEducationEdition_1.0.21.0_x64__8wekyb3d8bbwe.Appx 4. Set the following command to redeploy the app to run each time that a user signs in. For example for: Minecraft (Microsoft.MinecraftEducationEdition_1.0.21.0_x64__8wekyb3d8bbwe) Do powershell.Exe Add-AppxPackage -Path C:\Temp\Microsoft.MinecraftEducationEdition_1.0.21.0_x64__8wekyb3d8bbwe.Appx However, if you are using SCCM, Microsoft recommends you do not deploy the app package as a Configuration Manager application. For help choosing between online or offline app updates in SCCM, refer to this Microsoft guide. TIP: If you can't start Windows Store apps then you need to check if THESE settings or default registry or file permissions have been modified. KB3092053 states that this is caused due to leftover invalid entries in the registry, which causes a conflict when launching the installed or updated apps. Some Windows 10 users, especially those who may have bought new devices have been reporting that their Windows Store apps do not launch or open. This issue is being specifically noticed on those Windows 10 installations that have multiple User Accounts created. Among others who are facing this issue are some Windows Insiders as well as those who have not installed some Cumulative Updates.
You could also download and run this Troubleshooter and see if it helps. Windows Store apps do not launch 
While the Windows Store Apps Troubleshooter will troubleshoot and fix all issues and problems you may be facing. KB3092053 states that this issue occurs where – Prior to installing Windows Updates, multiple user accounts are created and one user installs or updates an app via the Windows Store while the other users are not signed in. In this scenario, the installed or updated apps may fail to launch for other users, and the Start menu will not dismiss. This scenario creates leftover invalid entries in the registry, which causes a conflict when launching the installed or updated apps. The apps affected could include Cortana, Start Menu, Microsoft Store, etc. Microsoft has classified this as a new and emerging issue 70008, and it is investigating the causes and solutions. But till such a time, the issue is fixed, Microsoft recommends that you download and run this troubleshooter. If you are not sure if this applies to your system, don't worry. Microsoft will make sure that it applies to your system before making any changes. So if you are facing issues with launching or opening Windows Store apps, go ahead and give this troubleshooter from Microsoft a try, and let us know if this worked for you. [It has been taken down]. Always a good idea to create a system restore point first. I hope you find this post informative enough! Related read: Microsoft Store not opening or closes immediately after opening. 
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