Current stable version (v. 4.1.2) of the code, released 2009-12-15, in tar-gzipped format:

• espresso-4.1.2.tar.gz (released 2009-12-15)
  Sources and documentation for v.4.1.2 - does not include PWGui, tests and examples.
• espresso-4.1.1-examples.tar.gz (released 2009-12-15) Tests and examples for v.4.1.1 (same for 4.1.2)
• PWgui-4.1.1.tar.gz (released 2009-12-15) PWgui for v. 4.1.1 (same for 4.1.2)