In order to play on a WoW Private Server you must have a WoW Game Client for the particular version. At Zremax, we have a well documented tutorial on where you can download each client, and how to set it up.
There are many different clients for WoW, which you can read below:
In theory, there are actually more WoW Clients such as 4.0.6 and more, but the listed ones above are the most popular ones. The reason is that most of the servers run on these patches, so you don't really need for example a 4.0.6 client, because there are barely any servers supporting that.Since Cataclysm, there have been two Client versions possible to download. The first one being a minified and fast version of the game. This is quickly downloaded within a few minutes, but that's because it downloads the game while you play. The second client possibility (from Cataclysm and up), is a Full game client. This can take a few hours to download, but it doesn't download the content while you are playing. Therefore, the second option can be argued as more stable, whereas the first option is 'faster'.
In order to get started playing, there are some facts you need to know before being able to connect to your wanted server.
What version is the server on? This has a huge difference, because for each World of Warcraft Expansion, the client is different.
Therefore, you need to know the game version of the server. If you don't know the game-version, at least the expansion is necessary to know.
After you have registered on your wanted server, and registered yourself, you need to note down their Realmlist. Usually these servers also have a small Connection guide, where they have written the Realmlist.
Now that you got the realmlist, you're almost ready and set to start playing on your wanted server! You're ready to start downloading the client.
We have you covered here, as we have taken our time and research to find the best clients for each World of Warcraft Expansion, and have written a documentation and guide on how to set it up.
We have also written an article that provides you with a WoW Repack for almost every single expansion. They are hand-picked, and we made sure to only select the best and worthy ones to our list. We consider it as the most up to date list of all the versions. For example, we even provide you with a MoP Repack that is fully up to date.
After you have downloaded the WoW Client for the version you want to play on, you're all set to start playing! It's just about launching the WoW.exe, and enjoying the game. As you have learned, there are many different WoW Client Versions to choose between.