Why is activating with serial number necessary with every upgrade?

After activating Storyline with your serial number you get the message: "You won´t have to activate again"- but you do after every upgrade! What if I loose hold of the serial number? Where do you suggest I keep it to be safe?

I read that you can get hold of the serial number when you´re inside the programme under Help/About Articulate Storyline, but if you happen to say yes to an upgrade before you´ve copied the serial number from there, this trick doesn´t work. :-(

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