Need to replace PostgreSQL 7.4 with 7.3 on cygwin

Hi,
I'm running PostgreSQL 7.4 on Cygwin(Win XP Pro). Everything works
perfectly, but I have to replace the current version with a 7.3
version for development and testing reasons. I've tried to do this via
Cygwin setup, but there are no PostgreSQL 7.3 packages(only 7.4). Can
anybody tell me where to find older PostgreSQL packages to install on
Cygwin?
Any help will be appreciated!!!

Regards Jakub