Hey,
Thanks for trying out the project! Eventsystem checker is there to verify that an EventSystem is there to make the menu interactive, if you can manually verify that there is an EventSystem in the main scene then you can safely delete the one at that path in standard assets. In fact you can safely delete it regardless. It’s weird that it’s even there tbh, I’ll have a look more closely when I get to my computer.
You definitely will be able to get updates via Itch for this project. Actually now that Unity 2018.3 is out it’s due for an update so watch this space.
Thanks again,
Matt