I get an "Outdated Client" message when I try to play with my friends [closed]
This message refers to a mismatch between the Client version, and the Host version Minecraft. If you are running two different versions of the game, they will not be able to connect.
In the launcher, you can choose which version of Minecraft you wish to play. Make sure you and your friends are choosing the same version, and you will be able to play together.