N.B. Tacview is OPTIONAL for CMO.
Setup: You install Tacview Basic on Steam, and the Advanced version exists as a DLC for it.
Problem: While you can run Tacview Advanced from the Steam UI, running Tacview64.exe in the install directory just runs the demo version. As CMO needs to point to this, I worried what would happen when the demo period ends.
Solution/Update: I emailed Tacview tech support and the reply included:
You should point to the executable C:\Program Files (x86)\Steam\steamapps\common\Tacview\Tacview64.exe
For now please keep launching Tacview from the Steam UI.
In a coming update we are going to fix it so that you can launch the executable directly if you wish.
So all's good!