Working with ArcMap 10.3.1 and trying to load Attribute Assistant. Tried load versions from 6/2/2016 and 2/16/2017 and get the following error message:
No GUI components found in this Add-In. Add-In version does not match.
Cannot figure out what the issue is.
I would follow this and manually remove the old add in and then re-install
https://community.esri.com/thread/121214