You can install pgAgent using StackBuilder, which comes with the
PostgreSQL installers.
Thanks.
My problem is that server is without internet connection. I found workaround with applications-v2.xml file, but there is a link to version 3.2.1, according to http://www.pgadmin.org the latest version is 3.3.0 (since 2012-09-15), my postgres version is 9.2.2, so there is no option to download the latest binaries.
It would be nice to have an option to download pgagent binaries without stackbulider (what is a great tool for servers connected to internet).