IMac OS Sierra 10.12.6. Is it safe to Update to High Sierra 10.13.6. IMac is a 2010
2010 IMac. OS SIERRA 10.12.6
WAS RECOMENTED TO STAY IS SIERRA.
WOULD IT BE SAFE TO UPDATE TO HIGH SIERRA 10.13,6
iMac 21.5″, macOS 10.12
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Yes, it's safe.
I would recommend that you upgrade the OS to the newest version that Mac can run.
A late 2009 thru mid 2011 iMac can be upgraded to High Sierra 10.13.6 but no later version. See: How to download macOS - Apple Support