– Please use Safari browser to download profile configuration macOS 11 Beta 7: 
– How to download & Update Beta macOS 11 Beta 6 “Big Sur”
Here are all the models of Macs that can run MacOS Big Sur, according to Apple:
- MacBook, 2015 and later
- MacBook Air, 2013 and later
- MacBook Pro, late 2013 and later
- Mac Mini, 2014 and later
- iMac, 2014 and later
- iMac Pro (all models), 2017 and later
- Mac Pro, 2013 and later
Device details are updated and software updated Here