You can install to the latest version directly from the internet (via the Python Package index, where RecSQl is listed as http://pypi.python.org/pypi/RecSQL) with
pip install RecSQL
You can also download the source manually from https://github.com/orbeckst/RecSQL/releases and unpack it. Install from the unpacked source with
cd RecSQL-0.7.11 python setup.py install
The latest sources can be obtained by cloning the RecSQL github repository
git clone git://github.com/orbeckst/RecSQL.git
and installing from the source as above.
Additional requirements are numpy (and pysqlite for older versions of Python). pip will automatically attempt to download appropriate versions if none are currently installed.