Go to Settings > Apps > Google Play Store and tap Uninstall Updates first, then re-run your downloaded APK. Play Store Crashes Immediately After Opening

Using your device's browser, download the verified Google Play Store APK from APKMirror or APKPure as described above. The file will typically save to your "Downloads" folder.

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: Open-source operating system builds (like older LineageOS versions) frequently ship without Google proprietary applications pre-installed.

By following this guide, you can safely and successfully install the Google Play Store on your Android 5.1.1 device, ensuring continued access to the world's largest Android app ecosystem. Remember that security starts with the source—always prioritize verified, trusted repositories over convenience when downloading APK files.