Go to Steam, right-click on Ark and select Properties. On General tab, there is Launch Options. You can switch it to Ask when Starting Game if you still want to play on official servers later.
Once you start the game, make sure to select this option:
You can find more details about the bit versions here: "These cheats were made for the 64-bit version of the game, you are running the 32-bit version" - #2 by Ravenfyre