You have to download the Client Patch or Update or whatever beforehand, I believe, if you want to play SRO after Euro comes out - you can't choose not to download it, as then SRO won't work.
You can either download it via torrent on the Official SRO website, or you can download it from someone else's upload.
This is what I used:
http://files.filefront.com//;7966156;;/
Safest upload I could find, as Zypher himself uploaded it. It took me only 15 minutes to download, so I think it'll be faster than a torrent.