Can't Update MacBook OS
Hi everyone. Trying to update the OS on my MacBook Air (2017).
Current OS is macOS High Sierra 10.13.6. I can only access a "software update" button on the "About This Mac" screen and it leads me to a broken-looking App store with no available update in sight.
I've attached some pictures of what I see.
What I see after I click "software update." Takes me to App Store, then this.
Earlier today I somehow stumbled across some OS update page and ran an update that took 30 minutes...and it changed absolutely nothing. (Worth noting, I have plenty of storage space for an update to be downloaded to my computer)
My computer's Apple ID and and iTunes/App Store account used to be linked to one of my boss' emails he randomly used when he helped me set up the computer 4 years ago. He gave me the password but it never worked for updates because he had two factor authentication set up and I obviously don't have his cell phone with me to get a code. I managed to disconnect that old account of his and now have a personal account of mine connected to my computer, but it has made no change in what I can see or update. I'm not sure if that previous connection to my boss' email has anything to do with why I can't update my OS or any apps.
Any and all help is appreciated. I just got a notification that one of my necessary apps for work will cease functioning soon if I can't get my OS updated.
Thanks all!
MacBook Air 13″, macOS 10.13