CAUSES:
1. APK file is corrupted.
SOLUTION:
Download it from another source.
2. The App is no longer supported on your android version.
SOLUTION:
Download apps compatible with your device.
3. APK download destination is corrupted.
SOLUTION:
Change destination of downloads to internal.
4. File APK download is incomplete.
Make sure you have a good internet connection, Refresh the site and wait for the download to complete.
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