Make sure you have latest drivers.

Make sure you're using reasonable settings for your PC. Too high of settings can easily heat up your PC. I'd imagine there's guides to optimizing this game - what each setting does and which "cost" the most so you can figure out what to disable or turn down.

If you set settings that cause the game to crash before you can undo them, google where the config is stored and delete it - game should either auto detect or revert to default settings.

Finally, if it's not overambitious settings, then this kind of sounds like your card is trying to generate too many frames and is getting hot. Usually not a problem with lower/mid spec rigs but you never know.

If the game doesn't offer a way to cap it (at 60 if you can) in settings (many do) then googling "how to set a frame limit with nvidia control panel" will show you how to set a limit for a SPECIFIC game using nvidia control panel.

Good luck

what overheating symptoms are you experiencing? GPU or CPU at 80c isn't overheating. unless you experience throttling, then that's faulty hardware. GPU auto fans usually don't even go above 50~60% on 80c, you can manually crank it up to 100% if you don't mind your PC sound like a jet engine. but that's pointless since 80c is still a very safe temp. 

this game is pretty CPU intense. Have you checked your system for a needed cleaning? It's an older system and perhaps you need to clean and add new thermal paste to your heatsink/cpu.

check your motherboard chipset for an update, along with windows and vid drivers. Run a malware/virus scanner or double check to see what else could be running up your CPU. Check your start-up menu to see there are things you don't need that could possibly be adding to overtaxing your CPU.

80C is perfectly fine for Nvidia, as long as it's not above 85 you're okay.
When it does, clean/undust your rig.
Pc I had 20 years ago was sometimes reaching 95 and it never failed, I just gave it away because I built a new one.

Here is a guide on how to disable the launcher.

https://gamepretty.com/marvels-midnight-suns-how-to-disable-2k-launcher/

If that does not make your CPU temps normal, you could try undervolting your CPU in your BIOS. But try disabling the launcher first, I can give you a guide for the undervolt later.

Cap the fps at 30. No need for 60 fps or more in this genre. Your computer will thank you and your power bill is happy.

The game is not optmized. My PC is watercooled and this is the only game where the CPU breaks the 80-85 degrees celsius. Theres nothing you can do about it. The above suggestion of capping frame rates alleviates this to some degree.

Originally posted by DKH:

Does anyone have any idea how to solve this?

Extremely hard/nearly impossible method: reverse engineer/decompile and fix any inefficiencies, probably in C++ or assembly.

Far less stupid method: drop your settings and force your GPU to throttle at a certain workload.

If you don't understand either: then who cares because your temps are fine.

OP has disappeared since long, and 80C on an 6tgh gen CPU isn't even an issue - the CPU itself may be an issue as it's pretty old and weak
Reducing graphics settings or capping FPS won't help neither