I had a hunch , so I checked your video card vs minimum recommended
Your card Geforce GT 620 is at least twice faster.
https://www.videocardbenchmark.net/gpu_list.php
I think you'll be good for Realflight8 (unless you want to use VR)
The simulator on Steam is at competitive price. They offer refund if the playing time doesn't exceed 2 hours and couple of weeks from purchase.
https://store.steampowered.com/app/748460/RealFlight_8/