The source code for the software the runs PISCES is available via a Git code repository on the website GitHub at https://github.com/ucd-cws/pisces/issues - the best way to obtain a copy is to download TortoiseHg and “pull” a copy of the repository to your computer to work with. Snapshots are available on the downloads page of that site, but are not guaranteed to be current.
PISCES source code is written in Python and requires ArcGIS 10.2 (or higher) to run.
To run PISCES, you’ll need to know how! Documentation can be found in the subfolder 'documentation' of the repository – open index.html - for additional help, you may contact Nick Santos. However, this project is not currently active and time may not be available for assistance.