once you download from the link, go to the silent hunter 4 folder then go data, upcdataGe, then UPCC campaign data and then extract the folder here (using winrar), once done that go into the folder you extracted and go through the subfolders until you find the actual file (career start upc) , cut that and paste it in the UPCC campaing data and when it asks you if you want to replace the file click yes.
And you have your walter.
