Both. When you click on the purchase key button it will take about 5-10 seconds (that's why it says don't click more than once). The pop up screen will change to show you your key. By that time you should have two emails from uniden, one a purchase order number and the other your key. The key will also display on your 'my scanners' page whenever you log into your account. As imonitor posted, take your time inputting everything, including dashes, and it really is very easy.Did you get the codes immediately or in a email?
One other tip-Yeah the only difficult part is to correctly enter the key for the upgrade you purchased. If you may a key stroke error, it tells you that you entered the wrong key. From there you try again until you get it. It does take several seconds to process things once you've entered the key, so be patient and don't assume a problem.
Just a couple of hours ago I upgraded a scanner with no issues.