The upgrade cost is equivalent to a 10-year license price, minus what you’ve already paid.
I’ve already bought a 1 year licence but forgot to buy lifetime last Black Friday and mine is due to expire soon.
If I buy a 5 year licence now, what will the cost of a lifetime licence be next Black Friday? $65 - $40 = $25 or $65 - $40 - $20 = $5?