I'm sorry for the inconvenience.
It seems like you're trying to access the game using an old version of the client, which is not possible.
In order to be able to access the server, you need to download the latest client from PRO WEBSITE DOWNLOAD. Please, make sure to delete the old client and all the remaining files in order to not experience any issue with the new client.
Let me know if you have been able to solve your issue and if you have any further questions.
Have a wonderful day !