I own a MacBook Pro 13 inch with 128gb and this update was stressful. I had to move basically everything on Mac to an external ssd including the Big Sur installer. Whatever I moved the storage was not updating. I almost gave up but then I restarted my Mac and finally it showed there was enough space available. The update installed and took about 30minutes. After the update there was more storage available. Hope this helps someone!
arora19
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