Post upgrade from AEM 6.2 with SP1 to AEM 6.4 few of the packages are not installed. The older version is on installed state.
For the new package is showing the message as "A different version seems to be installed:" see the below screen shot.
Because of this i could see few of the scripts are not updated with latest API.
For example
AEM 6.4 upgraded instance : /libs/cq/ui/components/widget/html.jsp -> API reference com.day.cq.widget.HtmlLibraryManager
AEM 6.4 Vanila instance : /libs/cq/ui/components/widget/html.jsp -> API reference com.adobe.granite.ui.clientlibs.HtmlLibraryManager
This issue is currently resolved by overlaying the file and updated with the new API com.adobe.granite.ui.clientlibs.HtmlLibraryManager
This package is not able to install manually. When i am trying to install getting the error as javax.jcr.nodetype.ConstraintViolationException: OakConstraint0074: Attempt to add, modify or remove the system maintained property 'rep:externalId'.