All files, including previous versions and source code, is available from the main Sourceforge download page located here.
Some of these links will download a MediaCenter Package file, which will automatically download and extract the zip file and install the dll into your plugins directory. If this fails, please download the zip file directly and use the local_install.mjp package file instead.
Others of these links will download a zip file (from the first available mirror site). To install, extract the zip and double-click the mjp package install file.