Extract and Unzip elasticsearch-8.1.0-windows-x86_64.zip

Extract and Unzip kibana-8.1.0-windows-x86_64.zip

Rename the folders to 
elasticsearch-8.1.0
kibana-8.1.0

Modify the file "C:\elasticsearch-8.1.0\config\elasticsearch.yml"

Add below line

xpack.security.enabled: false

at the end

Start the elasticsearch server

Open Command Prompt or Cmd prompt window
cd C:\elasticsearch-8.1.0\bin
elasticsearch.bat


Start the kibana server

Open a New Command Prompt or Cmd prompt window
cd C:\kibana-8.1.0\bin
kibana.bat