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No need for the “original version”.
To cleanly install the Zibo mod, first install the base version, then the single latest (or desired) update version on top of the base version. A base version includes the full complete aircraft, e.g. the latest release being B737-800X_3_37_full.zip, as of this writing. You can tell a full version by its size—over 1GB. Next, copy the chosen update files over the already installed base (overwriting some base files), e.g. B738x_3_37_18.zip. The update zip files are much smaller in size. Each update package is “Cumulative”, i.e. you can go directly from a base to any update file derived from the same base, without the intermediate updates.
As if today, do B737-800X_3_37_full + B738X_37_18.zip if you’re on X-Plane 11.36.
Or B737-800X_3_37_full + B738X_38_rc5.zip if you have X-Plane 11.40.
This site is no longer being actively maintained.