Latest files download
Download pcalendar-XXX.jar file of the most recent version from the project download page and save it to any convenient location.
In most cases the application can be started by simple double click on JAR file. If for some reason this does not work try executing command like the following:
Periodic Calendar is a stand-alone application which requires Java Runtime Environment (JRE) version 1.6 or higher. This is a standard component which is included in most of the modern GNU/Linux distributions. You can download Java installer for Windows from the official Java site.
Old Gtkmm Version files download
You still can download the previous (gtkmm-based) version of Periodic Calendar 2.x, however this branch will not be developed and maintained further unless someone will volunteer to continue working on this branch.