Steps to reproduce

1. (optional) change your username to include one or more spaces
2. If you have already br installed, run br --install
3. run broot --install
4. the command above creates $HOME\Documents\WindowsPowershell\Profile.ps1 with the following contents (when username is "User Name")

. C:\Users\User\ Name\AppData\Roaming\dystroy\broot\config\launcher\powershell\br.ps1

Possible solution

Use $HOME environment variable instead so windows will automatically expand it on execution appropriately.