AdLinkFly uses ionCube to protect some PHP files, primarily files related to license verification. This helps prevent unauthorized redistribution, protecting customers who purchase valid licenses as well as the development work behind the product.
If unlicensed copies were widely distributed, they could be used to operate many unauthorized websites. That would be unfair to licensed customers and would reduce the resources available for future development, updates, and support.
You can still install and configure AdLinkFly, create full or child custom themes, and modify files that are not encoded. The protected files must remain unchanged, and the server must have a compatible ionCube Loader to run them.