VERIFIED SOLUTION i
The Oracle Spatial option is missing from File > Open DBMS Connection
The usual reason you would not see the Oracle Spatial option would be that the Oracle Client was installed after MapInfo Professional.
ResolutionUPDATED: August 25, 2017
If the Oracle Spatial Client is installed on the computer, uninstalling and reinstalling MapInfo Professional should provide you with an option of “Oracle Spatial” when you go to File > Open DBMS connection.