DTS Audio screen when playing movie

For context, I have Infuse PRO and was trying to watch a movie when I was met with a screen saying “DTS Audio - Hear every detail with added support for high quality DTS audio. Included with PRO”, a button saying “Unlock for FREE” and another one saying "Remind Me Later (10 days remaining)

I suppose this is supposed to let me know that the feature has been added, but what’s the deal with the “10 days remaining”?

In case you have network or account issues that prevent you from making the free purchase at that time. Apple purchases can sometimes be finicky