The required assembly 'Microsoft.Dynamics.Framework.Tools.ApplicationExplorer.dll' does not exists.
I was applying Platform update 10.0.14 to one of our internal server when I got this error. The required assembly 'Microsoft.Dynamics.Framework.Tools.ApplicationExplorer.dll' does not exists. To resolve this error I just copied dll to location on which it was throwing error and that's it. I rerun the step and my issue resolved.