User was able to connect to Teradata database with Toad Data Point 3.6.
On subsequent upgrades, 3.7 and 3.8, upon connecting Toad Data Point returned above login error.
Please install .Net Data Provider for Teradata
Could not load file or assembly 'Teradata.Client.Provider, Version=18.104.22.168, Culture=neutral, PublicKeyToken=76b417ee2e04956c' or one of its dependencies.
The system cannot find the file specified.