I am installing Google App Engine under Windows (not using Cygwin).
After running the bat script, I closed and reopened the cmd.exe and entered inside the
For me the system path variable C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin was already set. Had to add C:\Program Files\Google\Cloud SDK\google-cloud-sdk.staging\bin as well to get it up working smoothly.
Hope this resolves the issue