Instead of provide 2 extensions… Why dont you create just one extension and make there android version checks?
It would be much easier for people to use then your extension.
Ty 
and after completing the download do you use the activity starter to start the installation?
yes, as described here https://community.appybuilder.com/t/how-to-make-app-a-trusted-source-to-allow-app-installs-w-api26/17424/17
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i am very new here .
how do i setup for scoped storage for android 10 and eventually 11
can a link be added this has to have been asked
I have updated the extension, I have not tested it on all versions, but I think it should work on Android, 5, 6, 7, 8 and 9. On Android 10 it doesn’t work.
It is com.KIO4_Install_v3.aix
http://kio4.com/appinventor/244_extension_instalar_app.htm
Edit: goto message 34
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@vardandevelopersassociati I moved your anwer into the correct thread…
did you use the latest version 3 of the extension, see here?
Taifun
@gleminem1 @vardandevelopersassociati
Are you using your own package name as the error message in the image looks familiar.
If so try with default package name
i have changed my custom package name ,if i change again it to default i will find other issue
I Tested This Latest Version V3
It’s working on
Realme 5 Pro Android 10
Huawei Nova 3i Android 9.1
Updated
Infinix Smart 4 Android 9.0
Huawei P8Lite Android 5.0.1
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Yes, I confirm.
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@juananton1991 This issue is because apps on newer Android versions must use a File Provider in AndroidManifest.xml.
By this error, I’m assuming you’re using intent.setDataAndType(FileProvider.getUriForFile(context, Uri.fromFile(file).getAuthority(), file), "application/vnd.android.package-archive") which I just tried and got the same exact error.
I recommend to switch over to the PackageInstaller since it will work for Android 5+. Although I have tried this already, I didn’t get errors, but the APK didn’t install.
Maybe some would like to test this APK to install an APK (testAPK.apk , 3MB / AI2) (which is in the assets or can be downloaded from Google Drive and is copied into the ASD).
(ASD = app-specific directory)
installAPK.apk (7.9 MB)
So check this especially on Android 9 and 10.
Try adding GRANT_READ_URI_PERMISSION flag to intent.
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Yess, It worked 
Finally
Install Sucessful Both in assets and downloaded.
Problem in deleting file. Says file dosen’t exist.
Checked in Android 10
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Because it tries to delete all files (also from the folder /Download). But if you haven’t downloaded from GDrive, this file doesn’t exist. So no problem. Its only to simplify testing.
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It worked in android 10…
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Sorry I do not know but can I ask that this extension can install app in background ?