How To Update Macos High Sierra — 10136 To 1015

Stuck at version 10.13.6, need 10.15. Not… - Apple Community

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To help me tailor any further troubleshooting advice, let me know: What specific do you have? Stuck at version 10

macOS Catalina is quite selective. If your Mac model is from Mid-2012 or later, you're likely in the clear. You can find your Mac's model and year by clicking the () in the top-left corner of your screen and selecting "About This Mac." Stuck at version 10.13.6