Icinga for Windows upgrade path

I am currently in the process of updating our Icinga installations on Windows machines. I saw that there is an Icinga Powershell framework now and was wondering: How do I correctly update a “classic” installation to the latest version.
Do I install the Powershell framework and then install/upgrade the agent? Can I uninstall NSClient now if I don’t use it?
What is the best practise way to update/upgrade an Icinga (client) installation right now?