It won't let me install it as it says this:
JInstaller: :Install: Error SQL Duplicate column name 'kmllayer'
Extension installation aborted.
Package Update: There was an error installing an extension: com_zhgooglemap.zip
Warning
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/components/com_zhgooglemap/models
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/components/com_zhgooglemap/views
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/administrator/components/com_zhgooglemap/models
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/administrator/components/com_zhgooglemap/views
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/administrator/components/com_zhgooglemap/controllers
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/administrator/components/com_zhgooglemap/tables
Joomla\CMS\Filesystem\Folder::delete: Path is not a folder. Path: [ROOT]/administrator/components/com_zhgooglemap/helpers
JInstaller: :Install: Error SQL Duplicate column name 'kmllayer'
Extension installation aborted.
Before updating ensure that the update is compatible with your Joomla! installation.
You are strongly advised to make a backup of your site's files and database before you start updating.
snipboard.io/LyolMQ.jpg
This is happening on every site I am migrating.