SuperSU is an app that used to be available on the Google Play Store that would allow root access to the apps that require root access to the operating system before they can run. These are apps whose features cannot work without rooting permissions which are higher administrative level permissions.

SuperSU generally is installed via a custom recovery image. So you may need to install TWRP or CWM before you get root access after installing SuperSU via the custom recovery image.

SuperSU allows the control of individual apps’ rooting permissions; however, it is not as reliable as Magisk in hiding root access.

Download SuperSU (All Versions)

In conclusion, that is how to download all versions of the SuperSU app to get root access.