The latest downloads for Lucee 5 can be found here:
Get a download bundle from Lucee for the current stable or beta release
The Express version is an easy setup version which means that it does not need to be installed. Just extract the zip file onto your computer and without further installation you can start by executing the corresponding start file. This is especially interesting if you e.g. would like to get to know Lucee and want to test your applications under Lucee or simply use it as development background.
You can sign up for updates about Lucee Server here.