Download Version 2.3 (Client Only)

Download Version 2.3.5 (Client Only)

Download Version 2.4 (Client Only)

Download Version 2.5.1 (Client Only)

You must upgrade incrementally, so, if you have any version 2.2.5, you must got to 2.3, then to 2.3.5, then to 2.4.

Also, your client must be at or below the version of your server.  So, if your server is 2.3.5, that is the highest version you can install on your clients.