| Error Message | Likely Cause | Potential Fix | | :--- | :--- | :--- | | "App not installed" | Signature conflict (the mod APK has a different signature than the official app). | Uninstall the official app first. | | "Parse error" | Android version too low or APK is corrupted. | Try an older version of the target app. | | "Download failed at 99%" | Server-side throttling or unstable CDN. | Use a VPN to change region, or wait 24 hours. | | "Virus detected" | Google Play Protect blocking the file. | Disable Play Protect (very dangerous – not recommended). |