hi, I'm struggling with initial setup, I tried for a few hours, with no luck, so I'm hoping it something simple I'm missing

(Python, GIT, pipx all installed and working)
and glasgow git cloned to   \AppData\Local\GIT\glasgow

I cant get this command to run  (using Win10)

pipx install -e 'glasgow/software[builtin-toolchain]'

it returns

Unable to parse package spec: 'glasgow/software[builtin-toolchain]'

I tried variations , but they all fail


what am I missing? , thanks