I strongly recommend avoiding unless you fully trust the source and are prepared to restore a backup. Use OpenGApps for Android 9 (Pie) — it’s safer, widely tested, and still available from their archive.

: The installer will prompt you to install several Google apps one by one. You must each installation as it appears. Finalize & Reboot : Once all apps are installed, your phone. Set Permissions : After restarting, go to your system settings and grant Full Permissions

Avoid sketchy “GApps installer” websites that bundle malware. Always check file signatures and scan with VirusTotal if unsure.