In Windows Server Manager, click Add roles and features.
(Optional) If Before You Begin is displayed, click Next.
On the Installation Type page, make sure Role-based or feature-based installation is selected and then click Next.
On the Server Selection page, select your server and click Next.
Expand Web Server (IIS), Web Server, and then Application Development.
Select ISAPI Extensions and ISAPI Filters, then click Next.
Click Next on the Features page.
Click Install.