Updating my macOS verison on my iMac.
I have an iMac 27" 2020, right now the software is macOS Catalina. I need to update the software to macOS version 12. But when going to do this normally it says my mac is up-to-date. I am a photographer and I need to download adobe lightroom but the macOS version installed isn't new enough. Doing my research my computer should support the version 12 software update but I am just struggling with how to do it. Any advice would be greatly appreciated.
iMac 27″