How to update iMac mid-2011 from 10.12.6 to 10.13
Hello. Ive watched numerous of youtube videos and can't seem to get a straight and true answer on how to update my iMac. Every time I go to the store it says it can't then I do it manually from apple.com/downloads and it says I need 10.13. I just really want High Sierra. I have a iMac Mid-2011. I should be able to have it I've seen people with 2010s with it. if anyone knows how to do this please help. THANKS
iMac Line (2012 and Later)