У вашего броузера проблема в совместимости с HTML5
Marketplace page: https://www.unrealengine.com/marketplace/advanced-turn-based-tile-toolkit
This tutorial showcases the 2D game example included in the toolkit and explains how it works.
Link to support thread on the UE4 forums: https://forums.unrealengine.com/showthread.php?60108-Advanced-Turn-Based-Tile-Toolkit-Marketplace-Summer-Sale-30-off!
Link to the RLTiles tileset: http://opengameart.org/content/dungeon-crawl-32x32-tiles
Link to Jon Lunde's soundcloud: https://soundcloud.com/marengs