I managed to find the prerelease packages in the build scripts, and got it working through that. Make sure you restart the keybase service, as it doesn't happen automatically

https://s3.amazonaws.com/prerelease.keybase.io/index.html

I love you.

EDIT: Still doesn't work, unfortunately. I get the /keybase dir, but it's empty.

This needs to be more visible in this thread.

I'm not the grandparent, I don't have it installed. :P