Windows SP 1 service pack required?

Hello. I have some experience with UDK and decided to get UE4… Downloaded the launcher, but when I opened it up I get confronted with a message saying I need Windows SP 1. Considering it is a brand new PC it was understandable…
Now the problem: My ADSL usage is almost over its limits and I am so close to being Throttled. Now I wanted to download the SP, but on the download page there is a list of file names I can check to download(Since I close to being throttled I am wary of download massive files such as this SP) … Now I want to know if there is a reason why the SP is needed and what I need to download. I see no reason why UE4 wouldn’t run on my PC… Can someone please help me out. Really appreciated. Thanks!

Never mind, I figured it out. Thanks anyways…