Patch for US PC Version Question

[PeshmergaJ]

This may be along the same lines as other posts, but to be honest I'm confused by the whole patch business with the game, so I'm not sure. Sorry if it is.

I recently bought the US PC Version, and am trying to patch to the most current version. What patches do I need to get, and can anyone help me with the location of them? I downloaded version 1.11.3 Full, but when I attempt to install it, it tells me I have the wrong version. I cannot find a previous patch and I don't have any mods..etc installed, so I'm not sure what I'm missing. I bought the game from Best Buy I believe and my version is V 1.022.1 Standard.
Thanks much