100% 64 bit Release Engineer is now available from http://www.openmakesoftware.com/build-management/release-management
This version requires a 64 bit Windows machine, Java 1.7 64 bit or Java 1.8 64 bit, Postgresql Database 64 bit and Postgresql ODBC Driver 64 bit.
Deployments to 32 bit Windows Servers, 32 bit Linux/Unix are still available since Release Engineer is agent-less.