Android Studio 1.2 Release Candidate 2

The release is available in both the canary channel and the dev channel, so you can check for updates via Help > Check for Update... (on OSX, look in the Android Studio menu). This will download and install a patch rather than download a full IDE image. For all older other versions you will need to install it from scratch by installing one of the below .zip files. 

Windows Installer:

Zip Files: