If you are already running Android Studio, just restart it, or manually check for updates via Help > Check for Update... (on OSX, look in the Android Studio menu). This will download and install a small patch rather than download a full IDE image. We are not posting full installers for each weekly update. If you do not already have Android Studio, install the latest full install from http://developer.android.com/sdk/installing/studio.html#download . When you run that version, it will check for updates and upgrade itself via the patch mechanism.