The EPW installations are generally maintained by Weine Olovsson (firstname.lastname@example.org).
"EPW is the short name for "Electron-phonon Wannier". EPW is an open-source F90/MPI code which calculates properties related to the electron-phonon interaction using Density-Functional Perturbation Theory and Maximally Localized Wannier Functions."
EPW can be found together with some (but not all) of the Quantum ESPRESSO installations.
5.3.0 is found in:
The older version
5.0.0 is available in the installation: