ASP.NET Core app doesn't work: "500.31 - Failed to load ASP.NET Core runtime" or "502.5 - Process Failure"

Symptoms

• An ASP.NET Core application shows an error in the browser

  HTTP Error 500.31 - Failed to load ASP.NET Core runtime

  HTTP Error 502.5 - Process Failure

• Running the application manually fails with a message about a missing framework

  "C:\Program Files\dotnet\dotnet.exe" %plesk_vhosts%\example.com\httpdocs\mytestapp.dll
  It was not possible to find any compatible framework version
  The specified framework 'Microsoft.AspNetCore.App', version '2.2.0' was not found.

• The command dotnet --info shows that the .NET Core version from the error is not installed

Cause

The application requires a runtime version that is not installed on the system.

Resolution

1. Connect to the server via RDP

2. Install the runtime version required by the app (or an SDK that includes it): .NET Core downloads