There is a permissions issue produced by Big Sur sec policies. https://pgsnake.blogspot.com/2020/11/macos-big-sur-upgrade-breaking.html
This will happen if you're installing in the default location, which in this case is Library. I was struggling with this for a few days and found that if I define my own installation path not located in the Library folder(say some folder in my Desktop), I was able to install without issue.
Give that a try and see if it works for you.
Edit: Be sure to delete all previous failed installations if any exist.
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