Installing the GeoServer MBStyle extension
The MBStyle extension is listed on the GeoServer download page.
To install MBStyle extension:
- Download the http://sourceforge.net/projects/geoserver/files/GeoServer/2025.1/extensions/geoserver-2025.1-mbstyle-plugin.zip - Verify that the version number in the filename corresponds to the version of GeoServer you are running (for example 2025.1 above). 
- Extract the contents of the archive into the - WEB-INF/libdirectory in GeoServer. This extension includes two jars.
- Restart GeoServer. 
- To confirm successful installation, check for a new - MBStyleformat option in the Styles editor.