I don't understand the point of your reply.
You said you don't understand why that laptop isn't supported. It's considered obsolete by Apple's vintage and obsolete device policy. Everything of a certain age is considered unsupported even if there's nothing preventing the hardware from running the latest OS.
It's not an arbitrary decision. The 2012 Unibodies will become obsolete and unsupported at the end of October this year because they were last manufactured on October 22, 2013. Add seven years to that and you get the date that laptop rides off into the sunset.
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