To add an HS4 plugin simply click Add on the Products page and select HS4 from the drop-down menu.
HS3 > HS4 Compatible Plugin
Upon editing an existing HS3 plugin. Each plugin will have the option to be marked as Compatible with HS4. Checking this box indicates that the plugin does not have major issues that need to be addressed by the HS4 development team. We recommend checking Event creation and Device layout before indicating that a plugin is compatible with HS4.