Ok so there's a slight problem. I tried this as well and it still didn't work properly? I can try it again though.
Viewing post in Permanent keys?
Ah shoot, sorry - I completely forgot that this demo actually saves files in the Crisis_Point_2019_Public_Demo folder within local appdata, rather than the Crisis_Point_Extinction folder. You just need to go to that folder instead and delete the keys.ini file in there, then reboot the game, that'll set all the controls back to default!