Ok so the installation and setup went great till I tried to export a pdf. I hit the convert now thingo and (in firefox) the download window pops up with the "Open with: Preview" (on a mac) selected which is all normal so far, when i hit ok absolutely nothing happens.
is there an option just to download the pdf to your desktop? - might want to try and tah then manually open the file in Preview - im not on mac so im not 100% - give it a go and let us know if it works