I should structure the paper with sections like Introduction, Features of Google Earth Pro, Discontinued Nature, Risks of Third-Party APKs, Legal Considerations, Alternatives, and Conclusion. Each section should explain the background, why it's problematic, and guide the user properly.

I should also mention that even if the APK works, support and updates won't be available, leading to potential software degradation or security vulnerabilities over time.

Since the user mentioned downloading an APK (which is specific to Android), even though Google Earth Pro was a desktop application, I need to clarify that there's no official Google Earth Pro for Android. The regular Google Earth app on Android doesn't have all the Pro features. Therefore, downloading an APK from an unofficial source might be risky. I should address the security concerns associated with third-party APKs, such as malware or privacy risks.