Are there step by step instructions on how to install Big Sur? It looks like I have the storage space, just don't know how to proceed. I have IMac 27in late 2015.
I have a late 2015 IMac and am running OS High Sierra. I want to install Big Sur and it looks like I have enough storage space to do that. Are there step by step instructions on how to do that. I am a novice. Also once installed do I de-install High Sierra.
iMac 27″, macOS 10.13