UnePapier

So i just downloaded the technic launcher so i could play pokeplay.io and it downloaded and everything but everytime i click play it give me a pop up saying ''You've selected Java 15, which is known to have issues with minecraft. Are you sure you want to continue?''. I click continue and the bottom bar loads then the launcher closes and opens back up immediately. Im using Java 15 64 bit if that changes anything and my macbook air can handle 64bit.