1. If the following error is coming after installing in manual (this bug is coming due to PHP version): Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM in {WINDOWS_PATH}\{TO}\eyeos-2.4\eyeos\system\kernel\services\Meta\implementations\MetaDataConverter.php on line 53 Than Please repalce it with : return eval('$handlerToLoad::getInstance()');//return $handlerToLoad::getInstance(); on line number 53 2. Release date : https://sourceforge.net/projects/eyeos25opensour/files/ 3. eyeOS only works with php version 5.3.x because php 7.0 above class name can not be same as constructor name and 5.4 and above childclass and parentclass must have same arguments, or a same access level