I tried to get the $79.00 version today, but it asked for a PlecoDict serial number, not an Oxford Dict 2.1 serial number. I did try, but it said it must be PDXXX-XXXX etc. Glitch???
No, just poor documentation on our end - you can retrieve that PlecoDict serial number from http://www.pleco.com/orders.html (it'll be re-sent along with your Oxford serial). For various reasons it was easier for us to key the upgrades to those serial numbers than to the Oxford ones.