When the game was released Windows 7 was still an active and supported operating system. As titles get updated, support for older operating systems can be phased out. The onus is on the user not to use an operating system that’s past end-of-life (support for Windows 7 ceased on Jan. 14th, 2020, so 4 years ago!). This is not a bait and switch.
Having said all that, I’m not sure if that’s actually the issue here, simply speculating.
Here you go: Troubleshooting for Killer Instinct Anniversary Edition - #147 by KRAKENJIMMY
Post in that thread.