If you have several computers that you want to upgrade. MS is selling discounted licenses for up to 5.
To put this in perspective, the first one is full price and any more up to 5 is 10% off. I paid $249 for mine, so numbers 2-6 would cost $224. An upgrade version at $160 costs $144 for the other computers.
My two cents, buy an OEM disk from NewEgg or someone else. $99 for the full version. Most people the license issues won’t matter.