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I gave it a go to install an hour ago, it went through this time. Wow. I kind of like what I'm seeing!
 
Despite on one occasion failing to install due to Dropbox which I later closed Dropbox the.install ran fine and I was able to run big sur just fine on the MacBook Pro 2020 13” Intel
 
I had the same problem when with my Macbook Air 11" inch 2013, but after a few attempts I got it all downloaded. Next struggle was to free up enough space on the 128 GB drive. Install finally started, but now it's stuck during installation (not first stage) with progress bar at 1/3:rd. :(
I left mine running over night (I'm in Sweden), and it was still stuck at the 1/3:rd progress. So I powered it off and on again, and guess what... it booted in Big Sur! :D And everything seems to be running just fine. :)
 
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