Install on windows went fine but running "pulumi up" from a git bash window says

$ pulumi up
error: --yes must be passed in to proceed when running in non-interactive mode

I tried powershell and it works just fine. Is there a known issue with git bash?

I don't believe this is a known issue. Mind opening an issue at github.com/pulumi/pulumi ?

I believe this is the same issue tracked in https://github.com/pulumi/pulumi/issues/5407.

Yes, that is exactly what I'm seeing, I'll add my details to the issue