Please see this page for the latest Android Studio Stable version.
Android Studio Latests Canary Builds
Note At this point, we recommend you keep 2.1.1 and 2.2 Beta 3 installed side by side; they already use separate settings and cache directories. More information on how to install multiple versions simultaneously. This will ensure a working development environment if you run into issues.
Due to a bug in Studio 2.2 Preview 1 you can not directly patch to this version. All other versions older than 2.2 will need to download a complete install of the IDE to update.
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In Android Studio 2.2, you may have noticed the larger download sizes than previous versions of Android Studio; this is because we now bundle a build of OpenJDK with the IDE to address various font rendering and stability issues.