First install? Android may ask permission to install apps from this browser — tap Settings, enable Allow from this source, then return and tap Install.

Already have the app? Tap Download & Install above — it will update the app you have. If Android shows “App not installed”, it means your current app is an older test version: uninstall the old CatalyseR app first (long-press its icon → Uninstall), then come back here and install this one. Future updates will then install automatically.