Install Opendistro alerting for Windows ES and Kibana

I am new to opendistro alerting feature. I have ES and Kibana installed on Windows. Based on data from ES i need to send a notification to opsgenie portal via alerting feature offered by Opendistro.

Can anyone please help me with doc or steps to install opendistro alerting plugin for windows ES and Kibana

I followed this link - and downloaded the Zip file and tried hitting the command elasticsearch-plugin install on powershell. I got Error: unknown plugin

Requesting your help to complete this task