User blog comment:Visually/Don't do "Summer's Over Update" before claim your mastery rewards./@comment-1308242-20151018060304

Got a free S class upgrade lying around? Actually trying to get the Lamborghini Huracán? You CAN use that free upgrade on the Huracán BUT BE WARNED if you have a free Huracán upgrade pending, and intend to use both at once DON'T. I did that and it gobbled up BOTH of my free upgrades.