Following are details about folders present in your downloaded package - smart_school_src_version_5.2.0: Main source code files required to install Smart School latest version 5.2.0. smart_school_update_5.1.0_to_5.2.0: Contains update package files for updating previous version 5.1.0 to new version 5.2.0. smart_school_update_4.2.0_to_5.2.0: Contains update package files for updating previous version 4.2.0 to new version 5.2.0. documentation: Complete User’s Manual for understanding how Smart School works. licensing: GPL license files. For help and support, feel free to contact us http://smart-school.in or open support ticket at our support portal http://support.qdocs.in or email us support@qdocs.in . Thanks for using Smart School QDOCS Support Team