For information on what is new in 0.3.0, read the Android Studio 0.3.0 Released page.
On Windows and Linux, you can incrementally update your existing 0.2.11, 0.2.12 and 0.2.13 installations by just using "Check for Updates" in your IDE, and applying the update mechanism which will patch your existing install.
However, a bug prevents incremental update on Mac OSX from working. Therefore, on Mac, you have to manually install 0.3.0 (unless you already installed 0.2.13; you can incrementally patch from that version. The bug has been fixed, and we have cherry-picked it into 0.2.13 such that future incremental updates should work correctly.)
IMPORTANT: Note that these .zip files do not include a bundled SDK, the way the original installer bits did. Therefore, if you were using the bundled installation of the SDK, rather than your own install somewhere else on your system, you may need to copy or move your
IMPORTANT: DO NOT unzip these files right on top of an existing installation. Create a new directory and install it there. Unzipping into an existing installation can result in a corrupted install, because older files that are no longer in the newer version of the IDE (for example because they have an older version number in them) can be automatically loaded and conflict and interfere with the IDE.
To install Android Studio on Mac:
On other platforms, if you do not already have Android Studio installed (or if your install is too old for patching):