Issue Description
APK files fail to install or show “App not installed” error.
Common Causes
- Unknown sources disabled
- Corrupt APK file
- App signature conflict
Step-by-Step Solution
Step 1: Enable Install Unknown Apps
- Settings → Security → Install unknown apps
- Allow permission for browser or file manager
Step 2: Verify APK Source
- Download APK only from trusted sources
- Re-download if file is corrupted
Step 3: Check App Conflicts
- Uninstall existing version of the app
Step 4: Restart Phone
- Retry APK installation
Explore Further
- Check Android version compatibility
Prevention & Best Practices
Avoid pirated APK files.