Is it zero or the letter 'O' in the key number? Vicky Po December 06, 2018 09:45 Updated Follow It's zero! We don't use 'O' letter in the key number. By the way, why don't you copy&paste the key? Related articles Unlimited vs 1-Year Premium Key How do I activate the Premium Key? Wrong application activated, what to do now? Payment methods No sound in Free Screen Video Recorder Comments 0 comments Article is closed for comments.