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Are you following the installation direction here?
If you get an error, see this page for help to enable the logs to diagnose the error: https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/iis/troubleshoot?view=aspnetcore-2.1#aspnet-core-module-stdout-log. The problem is usually a permissions problem.
I followed those steps
You will want to navigate to the logs folder. Find and open the most recent stdout log.
What does the log say?