I need to download exam software for my computer, but the software does not support Yosemite, my current OS. Preposterously, this $100 software costs $50 to "redownload", so I need to be absolutely sure it will work on this computer before trying it out.
I went to the App Store, checked "Updates", confirmed that macOS High Sierra was in the roster, and clicked the button to commence the update. My computer shut down, I saw the expected loading bar, my computer restarted, everything looks fine.
I check "About This Mac" and it still says OS X Yosemite 10.10.5. www.whatsmyos.com says I still have OS X 10.10.5. Typing "sw_vers" into the terminal prints out "ProductVersion: 10.10.5".
I check the App Store, and under "Updates Installed in the Last 30 Days" there is a row that clearly reads "macOS High Sierra" and "Installed May 6, 2019". The top of the page reads "No Updates are Available" so I can't attempt to update the OS again.
What's going on here?