IIS version 7.0 or greater is required to install Microsoft External Cache

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Product:
Cognos Analytics 11.0.10
Microsoft Windows 2016 Server

Issue:
When you try to install the ExternalDiskCache_amd64_en-US.msi you get a error.

Error Message:
IIS version 7.0 or greater is required to install Microsoft External Cache Version 1 for IIS 7

Workaround:
You can resolve this problem by modifying registry.

Open run dialog and enter regedit, to open the Registry Editor.
Find MajorVersion in the path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\InetStp and HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3SVC\Parameters.
Open the value MajorVersion and select Decimal radiobutton.
Change Its value from 10 to 9.
Click OK.

After finishing the steps above, you can install External Disk Cache and Microsoft Web Farm Framework successfully.

You can also try download a new version from here
https://blogs.iis.net/iisoobs

More Information
https://docs.microsoft.com/en-us/iis/extensions/installing-application-request-routing-arr/install-application-request-routing-version-2
http://www-01.ibm.com/support/docview.wss?uid=swg22000097