When you try to join your server does it say wrong version or its out of date? Lets fix that!
Login to lyhmepanel.com
- Click on Game Services under Game & Voice Management then if you have more then one server select the one you want to update
- Save and then stop your service then click on Steam Update then OK
Give it some time and then your service will be updated to the latest release of the game then click the x to close on the popup!