Download the official stable release from the Android Developer SDK site.
Android Studio's built-in update mechanism can be set to receive updates through any one of these 3 channels.
You can download the full installations of the build offered in each of these channels: Canary, Beta, Stable.
Alternatively, you can build it yourself, following the instructions in Build Overview.
To select the update channel for an Android Studio installation use the Preferences > System Settings > Updates menu option and choose the appropriate channel on which to check for updates.
When an update is available, you'll be prompted by the IDE.
Selecting update will display the update information dialog, which details information on the patch available, its size and its channel:
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