Hi Robert and Ammar.
I remember I had the same problem.
When you create an Installer, a text message with a download link is sent to that installer. The installer must use that link to download the application. If the installer tries to download the app by searching it on Play Store, he downloads the app, but it will not work properly. You must use the link sent by text message.
Try this, I hope this could help you.
Regards