I am unable to upload the "u2d-sys-7.470-480.tgz.gpg" using the web based upload form. It seems to be timing out as it keeps taking me back to the login screen in the section above the upload bar.
I ended up having to do a fresh install from the ISO on a Cd. I'm running successfully on a Astaro 120 rev 0 with 512MB ram. Works great for my wife and I but I could easily see it's not going to support many more users...