I reinstalled MacTeX-2015 yesterday to deal with some problems related to my recent "upgrade" to OS X 10.11 "El Capitan". Since reinstalling the TeXLive utility is giving me the message:
Repository URL has a newer TeXLive Version. Your TeX Live version is 0, but your default repository URL appears to be for TeX Live 2015. You need to manually upgrade to a newer version of TeX Live, as there will be no further updates for your version.
Clicking the upgrade button simply takes me to the MacTeX website. I would think that a fresh install of the latest version would remedy this, but that's apparently false since I have already done that. My current TeXLive version is 1.21.
Update: I manually deleted all my installed distributions in /usr/local/texlive (leaving only /usr/local/texlive/texmf-local) and then reinstalled. That replaced the directory /usr/local/texlive/2015, but has not resolved the problem.