To download Empower's Apple iOS app, from your phone navigate to the Apple App store.
On the right hand side at the bottom of the screen, select search (see highlighted below) and then search on either Empower Factory or Factory Productivity.
Click on Empower.
You should see a page similar to below. Click on the download from cloud icon (see highlighted below).
Finally click on Open (see highlighted below). This will install the app on your phone.