Oh, one has to register with a website just to demo a free plugin?! That is odd, to put it mildly. Makes me wonder why you are so interested in people's data, maybe selling e-mail addresses? No thanks.
Stop being paranoid and ungrateful. You dont have to register anywhere to get the plugin, except if you want the Members Only version from the MusicSociety Forum, which, as any other forum, requires signing up.
If you go to http://www.urbanite.karoo.net/tnaudio.htm and scroll down to 'Download Vsti' you will get a direct link to MediaFire for a ZIP that contains the DLL and Docs and thats that. Nobody is after your data here.