lol i initially read the OP as this too.
If you re-read their post you will understand that they bought the license for FULL price, then had to wait for the USB licenser to arrive. After the licenser had arrived the 50% sale was on BEFORE they had even had the chance to install/activate the product. So they are now at the point of not knowing whether to install or not if they can get some kind of refund.
I’d be pretty annoyed in that case. It’s nothing to do with not understanding that a licenser is required OR how long it took to arrive - it’s just the crap luck in timing they experienced. The opening line in their post is a bit misleading as it sounds like annoyance in waiting for the licenser to be posted. 
Glad i’m not the only one that mis-read initially.