Either or both. I got it working with 4.12.5 just with what you get from downloading, once I wanted to compile the engine and cook the content to give it to others then I spent time getting that part working which was a combination of troubles some on my end some with the plugin, after I fixed VS2015 I was still having troubles with the plugin but it was because I was trying to compile it through the launcher not VS2015. If you scroll up you can see a post from me where I am going through the process of getting to work including some of the error messages.
If you post your error or troubles I am sure we can help you get it working.
To START: All you should have to do is download it from , unzip it, and open up the example projects they give you, you should see water, boats, 3rd person character, ToD, and floating things in the default level it opens when you click Play in Editor or PIE. Did you get that far?
My Hardware was a 580GTX with i7 3770 nothing special I upgraded the video card to a 1080GTX after I made that WIP video. So it worked on a 6 year old card.
Do you have nvidia / intel ? are you on ?
