Can't Enable Hosting Because Parsec Says My PC Isn't Running Windows 8.1 or 10 But It Is

This article is for anyone unable to enable hosting due to Parsec believing the computer is running a version of Windows below 8.1 or 10.

Windows 7

If you get this message when running Windows 7, it's normal, because Windows 7 can't host.

Windows 10/8.1

On the computer you're trying to enable hosting on, visit 

Settings -> Hosting -> Advanced Settings 

And add the below line to your text file, then save, and restart Parsec from the icon in your Task Tray (by your computer's clock).

app_host=1