1. After installation the content will be deployed in "C:\AutoCAD Plant 3D 2025 Content\CPak Common\CPak EN 10365-2017 Steel Sections" Replace 2025 with your version.

2. The app auto-replaces the old catalog and you can start to use it without doing anything, it also makes a backup of your original catalog "Structural Catalog.acat.bak" just in case you want to roll it back.

To uninstall this content pack, please go to Control Panel => Programs and Features => select the "EN 10365-2017 Steel Sections" => Uninstall