If you are trying to open Hytale for the first time, you will 100% encounter a game loading issue, specifically 1.47 GB may take around 2-3 hours to download, even if you have high speed internet. 

Even if you managed to download Hytale + Standard edition, but an error still occurs (Photo below)
 You need, to reinstall the game several times, after which you will be able to enter the game.