I've found a solution....
For those interested in rewarded videos or just using the original "cordova-admob-pro" you can add it using Intel XDK and In your Construct 2 add the Browser object then add an action: Browser -> Execute Javascript: "AdMob.prepareInterstitial( {adId: 'ca-app-YOUR-ID', autoShow: false, overlap: true})"
and then later: "window.AdMob.showInterstitial();"
In other words: you don't need this plugin... You can use the "original cordova functions".
(this might sound normal to you but I'm new to construct and just found out about this...)
You can see the entire documentation here: https://github.com/floatinghotpot/cordova-admob-pro