that’s strange, you shouldn’t need an external software to be able to run it! Do you have a Mac? We were sadly unable to build for iOS :/
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I think Unreal games sometimes require an extension. I did not need to install anything extra to play, though I added an extension when I played another Unreal game on my Windows computer a while ago, so I might not have needed to. By the way, while the game loaded, it put my GPU up to 100% and even moving my cursor, took forever, so I had to stop :(