Google continuously updates its security measures, app verification, and target APIs. Version 6.6.0 cannot bypass the modern security protocols found in newer Android versions or handle the split APK formats used by the Google Play Store today. No Support for Modern Games
Custom patches are community-driven. Some older custom patches designed for specific games or apps were built during the era of version 6.6.0. Users sometimes find that updating the tool breaks the compatibility of these specific, older custom patches. The Major Drawbacks of Using Version 6.6.0 Today lucky patcher 660 better
You are using a modern smartphone (Android 10 or newer). A legacy version will likely fail to parse the package, crash, or fail to apply any modifications. Google continuously updates its security measures