November 26th, 2014: For information on what's new in 1.0 RC2, see the release announcement.
The release is available in the canary 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.
On Windows, please try out new installers:
Lean installer (no SDK bundle): https://dl.google.com/dl/android/studio/install/1.0.0-rc2/android-studio-ide-135.1611497-windows.exe (250 MB)
Full installer (includes SDK bundle): https://dl.google.com/dl/android/studio/install/1.0.0-rc2/android-studio-bundle-135.1611497-windows.exe (813 MB)
To install Android Studio manually:
Windows: https://dl.google.com/dl/android/studio/ide-zips/1.0.0-rc2/android-studio-ide-135.1611497-windows.zip (235 MB)
Mac: https://dl.google.com/dl/android/studio/ide-zips/1.0.0-rc2/android-studio-ide-135.1611497-mac.zip (234 MB)
NOTE: These .zip files do not contain an embedded SDK install. If you have an existing install of Studio which contains an embedded SDK, if you upgrade by installing one of these zips, make sure you copy over the SDK as well. We no longer recommend keeping the SDK installation inside the application folder, so after moving it out of the way, please place it somewhere else (such as your home directory), and then point to it from the IDE's project structure dialog.