Thanks for your reply and pleased to read that you upgraded from 6 to 4 without problems. I have written a number of e-mails to Curious Labs who keep telling me to check that my serial number has been entered correctly and not being a stupid person I have entered it the was it is written on their information and still have not answered follow up e-mails informing them of that. I refuse to pay for the full version when I meet the critera to upgrade and maybe one day I will get an answer from them and get my upgrade from 4 to 6 Best wishes and thanks, L13RAF