Upgrade Mac OS from El Capitan to Sierra
How can I find the build date of a serial number like W89072N87WY to check if an upgrade from El Capitan 10.11.6 is possible.
What’s the process to check for Sierra?
Apple has machine friendly names for Sierra here.
- https://support.apple.com/en-us/HT208202
Since you didn’t show that, use Everymac's Ultimate Mac Lookup
This is a MacBook "Core 2 Duo" 2.0 13" (Unibody), maximum macOS 10.11.x - so, no, it's been upgraded as far as it will go.