If I understand this correctly, when someone enters the server they get a message in the 'death message box'. If that is what your looking for, you dont need to add a download. Just alter the 'Engine.int' file under the Game Info Section. 

[GameInfo]
SwitchLevelMessage=Switching Levels
DefaultPlayerName=Player
[color=red:67cdc97441]LeftMessage=&quot; left the game.&quot;[/color:67cdc97441]
FailedSpawnMessage=Failed to spawn player actor
FailedPlaceMessage=Could not find starting spot (level might need a 'PlayerStart' actor)
NameChangedMessage=Name changed to 
[color=red:67cdc97441]EnteredMessage=&quot; entered the game.&quot;[/color:67cdc97441]
GameName=&quot;Game&quot;
MaxedOutMessage=Server is already at capacity.
WrongPassword=The password you entered is incorrect.
NeedPassword=You need to enter a password to join this game.
FailedTeamMessage=Could not find team for player