The latest version of Zen Cart is 1.5.6B and was released on 5/27/19. 

If done the right way a Zen Cart upgrade is much like starting over on a new website, with the exception of the design / logo / header / color scheme, etc. The software must be nstalled, the database updated, the old design files updated to the latest version and more.

As the Zen Cart site is upgraded, so are some of the modules or "add ons" that have been written to extend Zen Cart's capabilities. This price is for an upgrade of the store with no upgrade of installed modules. If you have modules installed, you will need to call me so I can let you know what modules will need to be upgraded and possibly what modules will not work with version 1.5.6B.  You can also use our search box and input 1.5.5 or 1.5.6B to see the mods we have tested and installed and are working with that version.  Chances are any mod working on 1.5.3 will also work on 1.5.4, 1.5.5+.and 1.5.6B

If you have any questions, please do not hesitate to call me prior to ordering.
If you are unsure of the mods that might be installed, you will probably want to fill out our Request For Quote Form PRIOR to placing your order, so we can give you a list of what you have installed so you can determine if you still want/need these zen cart modifications or whether they have been updated to work with the latest version you are upgrading to.