Update 2015 Macbook pro to Big Sur
I got a 2015 Macbook pro for my son for Xmas. It is running High Sierra but I'd like to update it to Big Sur. Everything I've read says it's compatible. MY personal Macbook Air is 2010 and it is running Big Sur. When I looked at the pro's settings to see if there was an update available there wasn't. I just received it and haven't been using it (obviously... it's for my son) but since I bought it certified refurbished I did want to make sure everything was in working order.
I'd be happy to provide any further information if that would be helpful. I've noticed this question has been asked a few times but has gone unanswered. Surely it is possible to update.
Any assistance will be appreciated!