Hi,
Open Xara Designer Pro...got to Plugins and open plugins> Select setup and browse to your folder ....download Plugins...select that then click 'create'...Xara will make a Xar info file. Now up on top select new and a fly out will open which if everything went correctly your plugin should be there.If not go to setup again and navigate to ...downlaod Plugins and see if that has sub directory...if it does then select that folder and then click 'create'. some times when you install plugins to your own directory the plugin installer creates its own directory within the one you chose.
JIm