That's really weird. Looks like it's on Silverstripe's end.
Most people use SVN rather than download it, because there are so many updates. The SVN URL is posted as a sticky in this forum.
I also keep the ZIP files on my website, however.
Thank you so much ! That's perfect.
Yes, I don't use SVN because I never had the opportunity to use it in a common project, but it can be a good one with Silverstripe !