Call Voice Changer
Installing an APK requires special actions that are different per phone.
For example, on Pixel phones you need to do the following:
1- Download ES File Explorer from Google play.
2 - Open the Settings app
Tap on Apps & notifications => Advanced => Special app access => Install unknown apps
Allow ES File Explorer
3 - Download the APK using the button above.
4 - Open ES File Explorer and click on the downloaded file