Step 2: Installing LR/Enfuse
Unzip the download. You should now have a plugin called 'LREnfuse.lrplugin' containing the plugin files. If your unzip program didn't keep this parent directory, then you should create it and copy your unzipped files into it.
Lightroom 2 or later
The plugin is installed via Lightroom's plugin manager.
Note that you also need to install the Enfuse application itself via the Configuration panel as described in the Quickguide.
If you have donated towards the project you should unlock the trial version using the registration code that you should have received.