SimSpec library is the Python package and is the core component of the SimSpec pipeling. You don't need to install this sperately if you are only interested in SimSpec pipeline. This libray will be only needed if you are planning to build your own pipeline based on SimSpec library.
The module is available in PIP repository, and can be installed as
pip install simspec-lib.
Detailed documentaiton of Classes and Functions in this module are to be added soon.