mac OS Sierra 10.13. 3 Upgrade

Whenever I attempt to update my laptop's software to this current one, it seems to go on a never ending loop of shutting down, restarting and not being updated. It keeps saying that something is missing from my laptop and is unable to do the update which I don't even attempt anymore but since I turn it off to save battery it keeps attempting to update itself to no success. I wanted to know if there's a way to update it or obtain what it's missing since the macOS installer isn't working properly and I have to choose a startup disk to actually use my laptop. Please help so I don't have to see that ridiculous update pop up any longer.