Hi Peter, the beta expires every so often and you’ll need to update it from the Testflight app. You can follow this Testflight link to get the latest version.
Our CEO, @jd-mullin, addressed the status of the iOS version here:
This is your space to ask questions, find support, and share ideas with fellow TextExpander users and our product team. As a first step, take a moment to introduce yourself to the community.