If you have it loading from your local folder, that suggests that the issue that you are facing is because the application cannot find the dependencies it needs. Remember that, just because you have put the DLLs in the remote folder, that doesn't necessarily mean you are using that folder for your references. Whichever technique you pick to load the remote file will have to take into account that its dependencies are going to be remote as well. This isn't specific to just WPF, this applies to pretty much any assembly you load from a remote folder. You will find this[^] is a useful read. Oh, and if you want to load it and unload it, you're going to have to use an AppDomain to loda the assembly into.
Look up TcpClient on MSDN. GetStream method does not throw any IOException, so must be the read-method. And yes, MSDN states[^] that an IOException is thrown when:
"The underlying Socket is closed."
Suggestion: open the socket. That might also give a timeout, but a connection-timeout. You should also test for all the exceptions mentioned in the documentation that I pointed to, as it may throw more than IOExceptions if implemented correctly.
Also, ticks aren't updated every ms, so that makes it useless for timing thight code
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]