Follow these steps :
1. Log in to your cPanel interface.
2. Scroll down to the Software/Services category.
3. Locate Softaculous and click-open it.
4. Locate and click on Zen Cart.
5. Click on the Install tab at the top of pane.
6. If your site carries SSL certification, choose HTTPS as protocol.
7. Select the domain name where you want to install it.
8. Enter a Directory, Database Name, Store Name, Store Owner, Store Address, Admin Name and Admin password.
9. Click the Install button.