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Toad sql error after installing Toad for SQL Server Freeware

I am getting the following error every time now on connection to any of my servers since I upgraded from 5.5 to 5.7. Any info on how to fix this would be greatly appreciated.

Null reference exception error

Exception Information

Exception: System.NullReferenceException
Message : Object reference not set to an instance of an object.
Stack Trace:
at Quest.Toad.SQLTuning.SQLTuning.IsSQLOptimizer7Installed()
at Quest.Toad.Editor.EditorForm…ctor()

Hi jdehart,

can you please advise if you have SQL Optimizer installed on your PC? if so what version?

Also, can you please let me know if you have access to this key in registry:

what can you see there?