While downloading it, gui editor may require two acl objects which are the general.ModifyOtherObjects and function.callRemote without getting or mentioning both's functionalities as its mentioned on the guieditor download website description to allow them you need to type these two lines in your console : aclrequest allow guieditor general.ModifyOtherObjects aclrequest allow guieditor function.callRemote Or just modify the acl.xml file directly where you will find both objects in the file with a false status to the permission just change from false to true