This post will show you how to deploy the New Teams client using a PowerShell script.
The Script
Install-NewTeams.ps1
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Parameters
When you run this script you need to pass some parameters. Use -Offline to install using the MSIX file (script will download this if you don't provide it) if you're providing the MSIX provide the path with -MSIXPath. Use -Uninstall to remove the provisioned New Teams package. You can specify your own staging folder with -TeamsFolder.