Just reporting what is on the plugin Developers page. Probably should have added that while I went through the usual, got a copy(of one-click installer), Filezilla'd it to my site, it shows in Filezilla, but when I go into my WP back end it doesn't show.
WP= 2.7.1
Theme= GEAR 1.2.6 (if memory serves)
Webhost= HostGator
URL=
http://robertnelsononline.com.
Even deleted a lot of unused plug-ins , no help other than less clutter on the site. Same problem when I tried to add the spam-free plug-in. Yet I was able to add the latest Gear theme manually. Haven't tried disabling AU to see what that does.