Same problem with the official download link resulting in 404 error message ... logged in or not to my dropbox account
Searching the web I (finally) found this place to download the plugin files : http://comsquare.dynvpn.de/forums/viewtopic.php?f=20&t=59&sid=0717204b7077026a993ff7d83ec17284
Installed and tested. Everything works fine.
Hint: Windows may refuse (ignore) to copy the files with "dlc" ending.
Make a copy of the original file and rename it to something like "file.xyz" copy them to the program directory and rename them back to the original name.