Cannot Install Homebrew on MACOS 11

[TGreat2014]

Output of brew config

No Output Given

Output of brew doctor

No Output Given

Description of issue

When I try to use homebrew on MACOS 11, it doesn't work and gives me a blank window.

[SMillerDev]

Not sure what you mean by a blank window, but macOS 11 isn't supported by Apple or Homebrew so it's likely that it won't work.

[TGreat2014]

Thanks, I'll look into upgrading my Mac soon.

[Darieb]

I use homebrew on MacOS 11.7.4. It works, mostly, but always reminds me that:

Warning: You are using macOS 11.
We (and Apple) do not provide support for this old version.
It is expected behaviour that some formulae will fail to build in this old version.
It is expected behaviour that Homebrew will be buggy and slow.
Do not create any issues about this on Homebrew's GitHub repositories.
...

A few things take a l-o-o-o-o-n-g time to compile, since there are no binaries available for the old machines. A very few will not install (e.g. glib 2.82.5 tries but fails, although 2.82.4 installed OK.)
AFAIK, brew has no "window" of its own; it works from command line (in a Terminal window with a shell.)
I'm just a user, but I don't know of an "interactive" mode: brew wants a command on every instance:

[brew command] SYNOPSIS
brew --version
brew command [--verbose|-v] [options] [formula] ...