The sources for EPCPyYes can be downloaded from the GitLab repository.
You can either clone the public repository:
$ git clone git://gitlab.com/serial-lab/EPCPyYes
Or download the tarball:
$ curl -OL https://gitlab.com/serial-lab/EPCPyYes/repository/archive.tar?ref=master
Once you have a copy of the source, you can install it with:
$ python setup.py install