Using a prior version of auvaltool
(Try this process at your own risk. Make a backup of all importatnt files.)
If you need a prior version of auvaltool, you can get it from your Time Machine back up.
In the Finder menu, click on Go To > Go to folder and type in /usr/bin
Locate the El Capitan auvaltool and make a copy of it to your desktop (a safety copy).
Replace auvaltool in the El Capitan /usr/bin folder with your Yosemite Time Machine backup auvaltool.
Reboot your Mac.