Auto-update
Turn on Auto-update in your project's App Settings before building, and every future build's installer checks for a newer version on launch, downloads it in the background, then prompts the user to restart once it's ready. Each new build you generate automatically becomes the version already-installed copies update to, there's no separate "publish an update" step.
Crash reports
Turn on Send crash reports in the same App Settings, and an installed copy that crashes reports it back to you automatically. Only the platform and app version are ever recorded, never the crash's actual contents, and you'll see a running crash count on your project's Overview tab.
Tip: Turning either of these on only affects builds made afterward — an already-downloaded installer doesn't retroactively gain the setting, generate a new build once you've turned it on.