This page contains nightly builds of Orange from the code repository. These are typically stable and we recommend using them.
Full package: Snapshot of Orange with Python 3 and required libraries
This package is recommended to those installing Orange for the first time. It includes all required libraries (Python, PythonWin, NumPy, PyQt, PyQwt ...), though it will not change any libraries you might already have.
Additional features can be added to Orange by installing add-ons. You can find add-on manager in Options menu.