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Click Server Manager.
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Click the Manage menu.
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Click Add roles and features and then follow the Add Role Wizard to the Server Roles section.
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Select Web Server (IIS) in the Roles list.
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Under Management Tool, select IIS 6 Management Compatibility.
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Under Application Development, select ASP.NET 3.5, ASP.NET 4.5 (Windows Server 2012 only), ASP.NET 4.6 (Windows Server 2016 only), and ISAPI Extensions.
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Click Next and then click Install.