An undocumented feature of Tacops is that a copy of an installed version will run perfectly well on another computer without needing to be installed. Before connecting USB's to office computers was banned, I used to run Tacops on my office computer at lunchtime off a USB. So if anyone has a copy of the installed version on an old PC or hard drive, it can simply be copied as is onto your newer computer.
But. There is always a but...
Tacops behaved well on every version of Windows until a recent update of Windows 10. Now, the unit selection panel does not appear during game set up, so it is no longer possible to start a new game. Saved games will load and play no problem, it is only the selection panel in set up.
Bummer, I never stopped playing it.