In order to build ATLauncher, you will need any Java version 8 or above. Java 8 is recommended since we compile to Java 8 compatability regardless. Everything else that's needed for the project is ...
For Java Edition Realms, sign in with your Microsoft account on Minecraft.net, open Realms, choose Buy Now next to the Java Realms subscription, agree to the EULA, and finish checkout. In the game, ...