If you’re installing the Spire app onto an iPad, you will need to first perform a search for “Spire” in the Apple App store. After the search complete’s, go to the top left of the screen and change the first option from “iPad Only” to “iPhone Only”. The search results should automatically update and one of the first apps listed should be “Spire - Activity tracking for body…”. Choose “Get” to install the app.
If your mobile device did not auto-update your Spire app to the latest version, simply search "Spire" in your mobile devices App Store and look for, "Spire – Activity Tracking for body…" by Spire, Inc.