If you are still seeing this issue please submit a ticket and we can get this fixed up. Normally this issue is due to the back end FTP service needing a restart.
You should see the outdated text go away after a minute once the version loads up. For the listing sadly there is not however you can set a password on the server.
Sadly the game will not show up in the steam server list due to how they are pulling the content for it. The developers currently use epic games to pull the list and just use steamcmd to download the files.
To order a dayz server you would head over to our order page. From there you will see an option to select dayz to order.
https://survivalservers.com/order/
Once you have the launch line set make sure to change the admin/serverDZ.cfg file within the FTP client to pull the Livonia map.
https://community.bistudio.com/wiki/DayZ:Server_Configuration#Launch_Parameters
Depends on what sort of server you want. If you are wanting to rent a server then it can be done in the following area. https://survivalservers.com/sspanel/?game=dayz
If you are wanting to setup a local server than you would look into installing via the app id and using steamcmd.