Use APKPure App
Get Export APK old version APK for Android
You can export the installed APP's APK file to external storage by this tool.
You can export the installed APP's APK file to external storage(SD card) by this tool.
How to use:
1.Enter this tool you will see all the installed app with grid view.
2.click an APP which you want to export.
3.click "OK" button and the apk file will be exported to external storage/export_apk folder.