Adding additional images has nothing to do with this mod.
You can find tutorials on this in the FAQ, in the Zen Cart Manual, or by using a utility like Image Handler 2.
This contrib. simply re-arranges the way these images are displayed.
By the way, I will soon publish a revised version that will have the shopping cart at the end of the product display.
You can take a look at my site (any product) to see how this displays.
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