This Add-on is upgrade from Event Scheduler 2.0 for oSC2.2 at,22 for oSC2.3.1 . This software pack supports both oSC2.2 and 2.3.1 which installation guide is mentioned in the included file "install_22-231.html". The directory "catalog_common" is mandatory for both versions and quoted from version 2.0 "as-is".. Credit to ALL Previous Contributions of this Add-on.