Azure PowerShell has reached a new major milestone with the release of the latest major version (5.0.0).
As for any new version there is a lot of improvements and new cmdlets but also few breaking changes.
To get the MSI package go there https://github.com/Azure/azure-powershell/releases/download/v5.0.0-November2017/azure-powershell.5.0.0.msi
To know all the breaking changes and update accordingly your scripts, go there https://aka.ms/azps-migration-guide