macbook air poor performance
I purchased my Macbook air for over months already. I used to update my software every now and then as long as the update was already available. Recently, I downloaded the update required for the MacOS unfortunately, it doesnt completed the download. I've tried to download it for several times but it never completed a 100%. i opted to shut it down because i want to sleep then, but i restarted my macbook instead just to check if there's any problem. But, it doesnt work. When i'm about to log on to my account it was just restarting to the apple logo and run the diagnostics. and prompted macos could not be installed on your computer. im quite disappointed now to use macbook. can somebody help me with this problem.
MacBook Air, macOS High Sierra (10.13.3)