This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
ICS View Tab¶
Illustration 15: Plugin Configuration: ICS View Tab
Refer to Illustration 15. - Show ics links: This is the only field in this tab. Enabling this option generates an ICS button to “Get this event as *.ics calendar entry” in the Frontend.