You can try but I don't think it will work. Best thing to do is to completely reinstall the client after completely removing the current client software, or;
If you friend has a laptop, and can/will come to you, and you get him on your lan, and he shares the directory in which he has installed the client, then you can copy his software over your version and you will have the same version.
Like I said in my previous post, when connection remotely to your server, your friend should use your external IP number in Razor (warriorshaven.servegame.com) and check the 'Patch client encryption'.
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