Just a heads up that when I was trying to reacquaint myself with all the details for this, there are several articles out that say to "use the app" after you've purchased and activated. I had used it for our trip in 2020, but could not locate it in the app store or through any links. I finally e-mailed Customer Service (really, still stellar) and they said they did away with the app and made their website mobile friendly instead.
So, please save yourself some time in the future not searching for it.