Zsite encrypted themes (which is purchased from Zsite official website) have to be decrypted before you use it. There are two ways to decrypt it,

1. Zend Guard Loader

It fits the situation that your space and virtual host that have Zend Guard Loader, or your runtime can install it(PHP TS cannot install it.). Please refer to 4.3 Install zend guard loader

2. Ioncube

It fits the situation Zsite, Zdoo, or ZenTao one-click installation packages which have Ioncube, or your runtime cannot install Zend Guard Loader. Please refer to 4.4 Install ioncube

Check Encryption

1. Create a new php file and write <?php phpinfo()?>.
2. Save it to the root directory of your website and visit this file in a browser.
3. On the Configuration page, it will show all the extensions installed.