Hi @hroderick-thr ,
you can change the driver version in file "TeradataWithADSupport_workflow_template.vm" usually located in "C:\Program Files\AlteryxConnect\webapps\ROOT\WEB-INF\classes\vm\designer_templates"
There should not be needed to restart connect instance, and itshould work instantly.
I suggest to use some reliable text editor like notepad++.
The value should be preserved until next connect upgrade. Should not be reverted by connect service restart.
Hope it help, and have a great day.