First you do not want to configure exactly like the demo. That is just an example.
Are you certain you have setup with Google a "Sandbox Sellers" account? (completely different accounts from your Live (production) Sellers account).
And are you certain the Merchant ID and Key numbers you entered are for your Sandbox Sellers account?
Please quote the specific error you are observing, commenting out any specific references to your account name and admin directory and Google Merchant ID/key. If not sure PM the error to me.
I provided very specific details how to fix this issue. But you have yet to report back on if you followed those recommendations.
To be honest here, and with all respect, if you cannot follow directions and solve this very simple issue, then there is not much hope in solving any other google checkout mod config issues which you are likely to encounter.
Probably not. if you cannot do this then you need to give some one you trust FTP access to upload a correct file and Zen Cart admin access to check module settings.
Woody
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