mombasa, I suggest you completely uninstall IPTV Stalker, checking the add-ons list to see if old versions are still there, and also delete the userdata "settings.xml". Get a new mac linked to your donation, then fill in the new mac and the 4 custom fields for the serial number, device id and signature on 9.0.21. Hundreds of people already have downloaded it, with only a few reporting problems, so I'm assuming there is something you missed.