I downloaded https://elements.envato.com/unlimited-3d-flags-23N38L4

I downloaded Unlimited 3D Flags by Make_Believe on Envato Elements

In the tutorials and help folder, there is no tutorial or help. There is only instructions on how to install a plug in,

so really, I have two issues. Where is the tutuorial/How to use the template, and

secondly. I followed instructions on installing the plug-in, but how do I know if its working? It’s by something called Make_Believe.

Can anyone help?

I don’t use After Effects but it’s likely once you install the plugin you should have access to it as a new Window. Maybe this video will help - How to install and run scripts - aescripts + aeplugins - aescripts.com