Hey!
I went ahead and uploaded a mirror of the Windows Server files for ATLAS in the UK.
You can download it here: https://cain.sh/atlas/WindowsServer_v5.9.zip
Alternatively, if you're in the US you can download from a closer location (NY) here: http://us.cain.sh/atlas/WindowsServer_v5.9.zip
Thanks @Veruse for providing the original.
Hey Chilimeat,
@Veruse is currently in the middle of uploading the mirror at the minute. Google Drive has a limit as to how often a file this large can be downloaded, and it seems like it passed that limit fairly quickly.