The trial version currently requires a PHP encryption script called IonCube Loader. This allows us to encrypt the trial version's code to prevent people from using the trial forever. The full version of ArrowChat does not require IonCube Loader and is 100% open-source.
Typically, you can ask your host to install IonCube and they will usually do it for you. If you are on an unmanaged server, you can download IonCube and get installation help at
http://get-loader.ioncube.comIf you already have IonCube installed and are still getting this message, please make sure you have downloaded and installed the latest version of IonCube. You can use phpinfo() to check the version and installation status.
Again, this requirement is only for the trial version. Alternatively, you can purchase ArrowChat and bypass IonCube altogether at
http://www.arrowchat.com/purchase/