BUN Install Errors

[EggBert001]

I am trying to install but getting an error when i try to run Bun Install in the YI dir / bun install
bun : The term 'bun' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the
spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1