How do I show Interstitial Ads in a blueprint project on IOS?

The “Show Interstital Ad” node is only android and Universal Ads is not for sale anymore.

Have you tried this?

This plugin takes a percentage of the money. Is there a way to do this without plugins?

My bad, it doesnt take a percentage but it does cost money. Is there a free way that doenst take a percentage? If not, is this plugin any different?
Ads Pro - Ads for your Game in Code Plugins - UE Marketplace (unrealengine.com)

I have not tried that plugin, so I can’t comment on how it compares. All I know is that at the time that I chose EasyAds Pro, the only other solution was an outrageously overpriced plugin that seemed to have a lot of issues (and apparently is no longer supported). EasyAds Pro is very well rated (see the reviews). But the short version is yes, you will need a plugin. There are some free solutions out there, but I do not know of any that don’t come with a whole host of complaints.