How to register a extension from a URL using powercli 5.5

We are trying to install a vcenter plugin (extension) from an URL.

We were using ' New-Plugin -url $url | Get-Plugin '  in powercli 5.0.1.

But now we moved to powercli 5.5, and found that cmdlets didnt get recognized in powercli 5.5

We wanted to know what is equivalent cmdlets in powercli 5.5?