It is now built in to FG. In the extension window scroll down and look for brown theme.
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This theme is now incorporated into FG and can be activated there in the usual way. Theme - Simple Brown/Grey.
As answered above, this is now "Theme - Simple Brown", available in your "Campaign Details" window when setting the options for your campaign. This was once available as a separate downloadable theme, but supporting it grew out of my abilities, and so t was given to Fantasy Grounds, who now keep it wonderfully functioning with all of their system upgrades.
Thanks everyone. I was feeling mighty stupid until those explanations arrived.
Since these themes are now included with standard download, I’m going to close the thread.
Cheers,
JPG