Thread:Project:Support desk/upgrade from 1.16.1 to 1.21.1 failing/reply

I had a similar issue when upgrading ours from 1.16 to 1.21... I ended up having to delete all the old files and put in a fresh install. (Be sure to back up the images folder and restore that once you've finished installing. :) I was able to leave the old DB up (e.g., putting in those parameters when going through the setup) and it was able to populate it OK.