THIS WORKED (!!)
Specifically, I opened the tws.vmoptions file in Text editor, and added the following:
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Is this what you were advocating doing? (Either way...it seems to have worked?)
So I went to the PC that had auto-updated, un-installed TWS completely, then used the installation file I still had for a previous version (10.12.2x), ran the Install but before launching TWS for the first time inserted the line above in the tws.vmoptions file in the JTS directory, then launched TWS and it didn't auto-update (and the order submission that the new version had broken works again!) Suspect it will fix all the other nonsense this buggy update seems to have introduced as well.
Bear in mind that you should update when major versions change. (First numbers of the serial)
Do not try to control the beast for so long, or it will spit on your face.

