Upgrading to ownCloud X

Looking to upgrade ownCloud from 9 to X on a Debian 8.8, but the repository says "file not found" and when I attempt to download it directly the only version I can find is the 9.

Is the 10 actually released, and if so where do you get it?

If this is an productive system please don't upgrade it to ownCloud X/10.0.0 yet. If that release is ready for productive use it will showing up in the "stable"repository you're currently using.

Unfortunately 10.0.0 was in the stable repo long enough to get onto my production system, although it doesn't appear to be in there anymore. I have managed to get everything but bookmarks working again. It has been frustrating. The recommendation against upgrading is sound.