Hi @IkaroSan86 - I moved your post to the Other SimCity Games forum, as you should get more specific help than in the SimCity 2013 forums.
I don't have any experience with SimCity 4, but I did some searching on your issue. From what I can find, the Origin version of SimCity 4 is downloaded and installed at version 1.1.610 and can not be patched higher.
Not sure where you acquired the 638 update, but this page lists the requirements for installation of that patch (edit: scroll to the section EP1 update) and may give you some more info: Of particular interest to you may be the notation for 638 "Note: Digital versions of SC4 do not require this, providing they are fully patched (1.1.641.0). A notable exception is the Origin edition which is both unpatched and unpatchable"
These FAQs have a bunch of useful information as well.
Hope this helps. Happy Building!
