The Omnia installer is based on the Conda package manager. It can be used with any Python executable, but the easiest way to get started is to download and install the Anaconda Python distribution. This also includes many useful scientific Python packages such as NumPy, SciPy, matplotlib, and IPython. We recommend Python 3.4.1, but any version will work.
Once you have Python and Conda installed, you can install Omnia from the terminal with a single line:
conda install -c https://conda.binstar.org/omnia omnia
If you don't have Conda installed, but do have the pip package manager, you can get it with
pip install conda