Hello there bud, sorry to hear you are having issues.
This server has a Launcher and Mod Pack available for use however it is in no way required to play.
Please see -
With exception of the above, this Server does not allow for Mods to be used so it important that you have removed any before attempting to play. This can be achieved by going to "Configure", "Expansions" and disabling all mods. The only mods that should be enabled are
Any Official Arma 3 DLC
Altis Life UK Modpack
If you are having issues and do not have any Mods enabled, please respond with the error message and we will do our best to assist further.
I sometimes get kicked off if I'm not fast enough in the lobby. Try getting a Civilian spot faster, if you don't get into the lobby you might just have to reconnect a bunch of times. (Because of full server)