I wouldn’t say it’s old. A new version of check_wmi_plus was released last month. And WMI is still valid. I like that on the one side you have a user and password authentication especially for WMI and on the other side an easy handling via GPO. You really should have a watch on the tutorial. It’s not that hard to get WMI running. And you can create a bunch of custom checks based on any Windows Counter.