1.

https://services.gradle.org/distributions/

https://services.gradle.org/distributions/gradle-4.1-all.zip

3.0.1 (November 2017)

This is a minor update to Android Studio 3.0 that includes general bug fixes and performance improvements.

2.

https://developer.android.com/studio/releases/index.html

https://developer.android.com/studio/releases/gradle-plugin.html

https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration.html