You can download CS-Cart and test it for free during 30 days. You will have test it in a Full mode with access to all the tools and functionality. A single person can use it only once.
When the trial period is over, you will be automatically switched to Free mode. Here you will have limited access to CS-Cart tools, but those are still enough to keep your store active.
If the Free mode doesn't meet your requirements, you can always get the Full mode by purchasing a full license.CS-CartMulti-Vendor