Despite the fact that the offer came on today’s SoS Giveaway[Thursday 10/10/2019], the “exclusive license key” is so exclusive that the Speedster software says “There is no active giveaway right now”.
Even trying to go to the author’s site produces an Error 404, which doesn’t engender any real confidence.
Shame, as it’s actually something which might be very useful: but if I can’t try it even for a few weeks, then I’m not in for it.