@jayemce do you not have any old table panels on your upgraded v7 installation?
For me, I upgraded Grafana from v6 to v7, all existing table panels remained as they were (running old v6 table panel within Grafana v7). If I create a new table panel it’s a v7 table panel. So I just copy/paste one of my old table panels. No need to reinstall Grafana v6 or anything like that, this is all on Grafana v7.