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/tags 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. pip will automatically attempt to download appropriate versions if none are currently installed.