I have installed this on ZenCart v1.3.7 and it works great!
Thank You :o)

I did have a discrepancy in the instructions.

"3. Add the following code to your define_contact_us.php
this is usually located in includes/languages/english/YOURTEMPLATE/define_contact_us.php"

For me at least it should read...

"3. Add the following code to your define_contact_us.php
this is usually located in includes/languages/english/html_includes/YOURTEMPLATE/define_contact_us.php"

Other than that, Everything else was correct, and it is probably due to different versions having different file structures.
I'm posting this to help others who's file structure is like mine, so they install it correctly.

Thanks again for your hard work!