After upgrading Mart from 9.x to either 2018 R1 or 2019 R1, when launching the erwin Mart Administrator page, it shows the incorrect version on the login screen and/or the Mart Admin Panel Home. Does it mean the upgrade was not successful?
No, it does not mean that the upgrade was not successful. It is most likely because of cache in the web browser which is still displaying the older version. Clear browser cache and relaunch the Mart Administrator and it should now display the correct version.