Okay. I was able to get one of my old dashboard working. This is what I did.
Go to the old version KX Dashboard folder. In my case KXDashboards-1.4.1.
Navigate to KXDashboards-1.4.1 > dash > data – folder. There are two folders here, “connection” and “dashboard”. This contains the connections and dashboards created.
Open the JSON files with Notepad or Notepad++ and check the name. This will be the name with which you saved your dashboard (Tip: Sort the files in descending order. Latest changed dashboards will be at top).
Copy over the connection and dashboards needed to the corresponding folders in new version.
Restart the dashboard.
Experts can confirm if this is the right approach.