Some days before TemplatesMonster has announced that the latest Zen-cart themes (templates) are updated for use with Zen-cart version 1.3x. These themes are fully compatible with the latest features.

According TemplateMonster:

For websites using the older versions of Zen we will still offer templates compatible with the older system, even while we offer the updated models. Templates for the old and new systems are not interchangeable so we will offer both.

That will say that users of older version of Zen-cart are able to use this new and modern templates.

Currently there are 20 unique templates with different styles for almost every kind of business.