Check the whole box, with my nortan, there was a ORDER key, PRODUCT key SERIAL key, and one more, look at all the number and letter combinations given to you, and then type them in, if none fit, try contacting them via phone or e-mail.
Check the fields carefully. Put the correct numbers of words in box. The product key can't be wrong. I had never faced this issue. If you are not able to enter product key, ask to F-Secure technicians through mail.
Answers & Comments
Check the whole box, with my nortan, there was a ORDER key, PRODUCT key SERIAL key, and one more, look at all the number and letter combinations given to you, and then type them in, if none fit, try contacting them via phone or e-mail.
Check the fields carefully. Put the correct numbers of words in box. The product key can't be wrong. I had never faced this issue. If you are not able to enter product key, ask to F-Secure technicians through mail.