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The 'App not Installed' error is a common problem that occurs when you try to install an app from third parties other than the Google Play Store. Contrary to popular assumption, this may not always be a software or app issue; instead, it could be a device issue.
When you try to install an app that is incompatible with the OS and software on your device, it may fail to install. As a result, you will receive the error message App Not Installed. The installation error might be caused by a number of factors, below are some reasons you encounter 'app not installed'
READ ALSO: How To Fix "App Note Compatible with Your Device" on playstore
WHAT CAUSE APP NOT INSTALLED?
1. Insufficient Space
App not installed is sometimes caused by Insufficient Space, For an application to fully run on your Android device You Must provide sufficient space for installation & sufficient space to save app data. when your storage space is low and unable to run an application You'll definitely get app not install notification,
2. Incomplete App
Incomplete Application also result to app not installed. Once you download an application from the internet and the download process isn't complete, when you try to install the app you will definitely face an app not install error, an Android application needs to function properly when download file is complete and not half way download.
3. Older version already Installed
An older version of application result to app not install error, Once you have an app already installed on your phone and you need the updated app, when you try to install the updated app leave leaving the older version on your phone, you'll definitely experience app not installed notification, older version of an application triggers the newly updated app version.
4. Corrupt App File
Corrupt Android applications are one of the most common issues that result to app not installed error message. A corrupt application contains malware that could be harmful to your Android. Corrupt application files kill Android operating systems even before installation.
5. App Permission
App permission is another reason why application often gets declined from installation, app permission is found in your Android device settings, it is meant for restricting app from installation, once you untick "install app from unknown source" you won't be able to install every application.
6. Corrupt storage
Once Your storage space is corrupted, Your Android device will be unable to run app installation, corrupt storage terminates app installation n also infects application with virus, corrupt storage is dangerous for app installation.
7. App not compatible with Your Os (Operating system)
we should all be aware that Android device are made of different versions, such as KitKat, Lollipop, & Marshmallow. an application must be compatible with Your android device in order to run properly. The most stable version of an app for your device is installed when you download it from the Google Play Store.
However, if you download an app from a third-party source, you can end up with a version that your phone doesn't support (due to CPU or GPU incompatibility, etc.). As a result, you can end up installing an app that isn't compatible with your smartphone. This could potentially result in the Application not installed issue.
READ ALSO: How to Fix App Not Compatible with Your Device on Playstore
How To Fix App not installed?
Fix 1. Reboot Your Device
When you encounter 'app not install' notice when trying to install an application, close down the application, hold down Your device power button & click on reboot. Rebooting your device actually means refreshing your device operating system. Once you reboot your phone all the recent running programs are closed, the Operating system becomes normal, all activities and programs are ready to run properly. After rebooting your phone go back to the app and reinstall, if that doesn't solve the issue move on to Fix 2
Fix 2. Free Your Storage Space
If You face 'app not install' notification when trying to install an application, check Your storage space, delete and free some space before trying to reinstall the app. low storage space is a major cause of app not installed issue. For an application to install n run on Your phone it needs some space to store data and also process the data.
Fix 3. Download App From Playstore
Avoid downloading applications from third parties source, because most of the app are usually modified, and once an application is modified it becomes difficult to install on your phone. The best recommendation to download an app is from Google Playstore, Google Playstore make sure an app is compatible with your device before downloading.
Fix 4. Uninstall and Delete Older App Version
Before installing an application make sure the older version isn't installed on your device else You would encounter 'App not installed' Error. An app old version triggers false installation to a newly updated app version, this happens when the old version of an application is modified and can't be able to complete an assigned task. However before trying to install an application on Your device make sure you get rid of the older version installed on your phone and then reinstall the updated app version, if these doesn't solve your problem move to fix 5
Fix 5. Sign & Allow App Permission.
If an application refuses to install, it might be that some permission for the application to run properly are declined or the developer of the app did not sign the app before publishing. To fix these First go to your phone setting n click on security, Next look for "Allow installation from unknown source" and tick on the square icon to allow permission. Go back to your app and reinstall if you still get an app not installed notification try to sign the application. To do this download & install the app signer from Playstore, launch the app signer, select the stubborn app that refuses to install and sign the app and then reinstall.
Final Thought
With all the above guide written, I hope you find the rightful solution to fix 'app not install' issue. if you implement all the strategies written in this article properly without a postive results, let know the type of app that refuse to install on Your phone in the comment section, i promise to give my best solution n support to resolve it.