Upgrade to Big Sur from Catalina on compatible iMac
I have a late 2017 iMac 27 inch i5 running Catalina which aI downloaded, made a bootable drive and made a clean install. I then used my bootcamp back up from my 2012 iMac to install all my data. Everything works just fine but I would like to upgrade to Big Sur rather than Venturer which from the app store seems to be my only choice. I have accessed the apple support site for older OS's and that just takes me to the App Store and when I press get Big Sur the store just continues trying to find it. Come on Apple, if you provide the links please make them usable. Anybody help me please.