Check Internet Connection:

Downloads require stable internet. Try WiFi instead of mobile data. Or vice versa to test.

Pause and Resume:

In the store, pause the download and tap again. Restarts the process. Simple solution that often works.

Check Available Storage:

Apps need space to download and install. Free up storage if nearly full.

Clear Store Cache:

Android: Settings > Apps > Play Store > Clear cache. iOS: Sign out and back into App Store.

Check Date and Time:

Wrong date/time causes download failures. Enable automatic date and time.

Restart Device:

Temporary system glitch. Restart and try downloading again.

Conclusion:

Storage and connection are most common issues. Clearing store cache resolves many failures.